Make Ahead Veggie Breakfast Casserole Recipe | Little Spice Jar (2024)

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A super simple veggie loaded breakfast casserole that’s easily customizable! I loaded mine with shredded potatohash browns, tons of fresh veggies, and a big dash of hot sauce! You can add crumbled sausage, shredded chicken, or anything else you please!

Make Ahead Veggie Breakfast Casserole Recipe | Little Spice Jar (1)

FRI-YAY!

I am so excited to be bringing you one of my all-time favorite breakfast casseroles. It’s loaded with shredded potato hash browns and tons ofsauteéd spinach, bell peppers, and mushrooms. Not only is it a cinch to whip up, but it’s also totally customizable! Be it sausage, ground chicken/turkey, shredded rotisserie chicken, or meatless – with tons of veggies like I made it. The options are endless.

Once you’ve got your protein picked out, grab your favorite cheese and start shredding.Mozzarella, swiss, and sharp cheddar are just some of the cheeses that will pair well with this casserole.

BUT BUT BUT! More reasons to make it –> you can MAKE IT AHEADand just bake it off in the morning. How good would this be for Halloween, Thanksgiving, or Christmas breakfast? A nice hearty and veggie loaded casserole that’ll keep you and the little ones going all day long.

How to make a veggie breakfast casserole:

Make Ahead Veggie Breakfast Casserole Recipe | Little Spice Jar (2)

I kind of debated whether I should actually call this a ‘breakfast casserole recipe’ as it’s more of a guideline that can easily be adapted to yourfamily’s breakfast casserole needs.

Did I mention it makes a ton? Like 10-12 servings! The hubby and I enjoyed this casserole for a couple of days but it’s one of those that actually tastes better with time. And yeah, you bet it was dinner the next day. But loaded with veggies and eggs, it’s hearty and keeps you full for hours afterward.

I spiced mine up with a whole ¼ cup of Franks hot sauce. And it gave the casserole so much flavor. If you’ve got little ones, you can cut the hot sauce back to a couple oftablespoons or leave it out altogether. But even with the ¼ cup added into the breakfast casserole, I still splashed on a little more before gobbling it down!

Make Ahead Veggie Breakfast Casserole Recipe | Little Spice Jar (3)

Let’s talk about the breakfast casserole recipe.

It’s super simple, I promise.

I sautéed the veggies separately in a skillet before layering them in. If you decide to use any kind of protein, just sauté it before adding it into the casserole.

So it starts like this – just spray a 9×13 casserole dish down with a good coating of cooking spray. We want the hash browns on the bottom to get nice and colored. Then add in the hash brown, pack them in firmly. Next, whisk the eggs, salt and pepper, milk, and if you’re using it, hot sauce, in a bowl and set it aside. Saute and add your protein +veggies on top of the potatoes and drizzle on your egg mixture. Top it with your favorite cheese and that’s it! Let it all bake up for 45 minutes and you’ve got a perfect breakfast casserole that’s great for brunch or lazy Saturday mornings.

Sometimes I like to assemble the casserole from the night before and let it come to room temperature for about 20 minutes while I enjoy a cup of coffee and bake it off in the morning.

Lazy Saturday morning breakfasts are my favorite part of the whole week.

Make Ahead Veggie Breakfast Casserole Recipe | Little Spice Jar (4)

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Yield: serves 10-12

Veggie-Loaded Breakfast Casserole

Prep Time20 minutes

Cook Time45 minutes

Total Time1 hour 5 minutes

A super simple veggie loaded breakfast casserole that's easily customizable! I loaded mine with shredded potato hash browns, tons of fresh veggies, and a big dash of hot sauce! You can add crumbled sausage, shredded chicken, or anything else you please!

Make Ahead Veggie Breakfast Casserole Recipe | Little Spice Jar (5)

Ingredients

  • 2 tablespoons oil
  • 8-10 mushrooms, sliced
  • 2 teaspoon minced garlic
  • ½ red onion, diced
  • 2 bell peppers, diced
  • 2 cups packed baby spinach, roughly chopped
  • 20 ounces shredded potatoes, thawed
  • 10 eggs
  • ⅓ cup half and half or milk (see notes)
  • ¼ cup hot sauce (more or less to taste)
  • salt and pepper
  • 1 cup shredded cheese (see notes)

Instructions

  1. In a large skillet over medium heat, heat 1 tablespoon of oil. Add the mushrooms and sauté them for 4 minutes or until they start to brown. Add a small pinch of salt along withe onions and garlic and let cook for 2 minutes. Remove to a plate. Add the second tablespoon of oil, if needed, and sauté the peppers for 1 minute. Add in the baby spinach and allow it to wilt, remove from heat, set aside.
  2. Generously spray a 9x13 baking dish with nonstick cooking spray. Lay the shredded potatoes in the bottom of the dish and press to make sure they are spread out evenly. Add the veggies (both the mushrooms and the pepper mixtures) over the potatoes, set aside.
  3. Position a rack in the center of the oven and preheat the oven to 375ºF if you are baking the casserole immediately.
  4. In a large bowl, whisk together the egg, half and half, hot sauce, and a big pinch of salt and pepper. Pour the egg mixture over the prepared veggies. Sprinkle the cheese over the topand another small pinch of salt and pepper.
  5. Bake the casserole, uncovered, until the cheese melts, and the top gets in and golden, 45-50 minutes. Allow the casserole to cool for 10 minutes before slicing and serving.

Notes

  • TO MAKE AHEAD - prepare the casserole as directed, cover with plastic wrap and refrigerate overnight or as required (not to exceed 24 hours) and allow it to come to room temperature for 20 minutes before baking.
  • The half and half can be replaced with any nondairy milk such as almond, soy, cashew, etc.
  • OTHER ADD INS - I kept this recipe vegetarian, but you can certainly add in browned sausage, ground turkey/beef, shredded chicken or ham. The cheeses I recommend for this casserole are cheddar (mild or sharp), mozzarella, and pepper jack, or swiss).

Have you made this recipe?

If you enjoyed this recipe, please consider leaving a ⭐️⭐️⭐️⭐️⭐️ rating and a comment below. You can also share a picture on Instagram with the hashtag #LITTLESPICEJAR, I'd love to see what you made!

IS THIS A GOOD CHOICE FOR YOU?

Make Ahead Veggie Breakfast Casserole Recipe | Little Spice Jar (6)

*Please note: the nutritional factscalculated are an estimate based on the ingredientsI’ve used.If you’d like a more accurate count, please calculate them using the ingredients/brands you’ve used to prepare the recipe. The nutritional factsprovided are for 1/12th of the recipe, assuming you use⅓ cup milk and cheddar cheese.

Make Ahead Veggie Breakfast Casserole Recipe | Little Spice Jar (7)

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Make Ahead Veggie Breakfast Casserole Recipe | Little Spice Jar (2024)

FAQs

Is it better to freeze a breakfast casserole cooked or uncooked? ›

The answer depends on what's in it. Casseroles with raw protein (meat, poultry, seafood) should be completely cooked before freezing. However dishes with pre-cooked meats or no meat are fine to go in the freezer uncooked.

Why is my breakfast casserole soggy? ›

Why is my breakfast casserole soggy? The primary suspects are not pre-cooking the veggies and and not draining the sausage grease.

How do you reheat egg casserole without overcooking? ›

Cool to room temperature. Wrap tightly with foil or plastic wrap and refrigerate overnight, then reheat in a 375 F oven for 30 minutes the next morning until the casserole is browned and heated through.

How many days can you eat breakfast casserole? ›

Bake until the center of the casserole reaches an internal temperature of 160 °F as tested with a food thermometer. After baking, any leftovers must be refrigerated within two hours and can be kept three to four days in the refrigerator or frozen for about three months.

How long can a breakfast casserole be refrigerated before baking? ›

Success Tip: Refrigerate Overnight

At this point, you can either bake it right away or refrigerate the casserole overnight and for up to 24 hours. During this time, the flavors mingle together and the bread has a chance to soak up some of the liquid and flavor.

Can you make a casserole with raw egg and leave it uncooked overnight in the fridge? ›

Yes! You can assemble this casserole the night before, wrap it tightly and then refrigerate until the next morning. Then, bake according to recipe directions.

How do you moisten a dry breakfast casserole? ›

Covering the dish will trap the steam in and keep it moist while it heats. How do you moisten a dry casserole? Add a little water or milk to the top of the it before reheating.

How to thicken breakfast casserole? ›

Whisk together equal parts cornstarch and cold water in a small bowl. Use one tablespoon of cornstarch per cup of liquid you would like to thicken. Stir out all the lumps. A few minutes before your casserole is done, add it a little at a time until you are happy with the thickness.

Do you bake a casserole covered or uncovered? ›

Generally, casseroles with grains, rice or pasta that will cook during the baking process are usually covered, for at least part of the time. Casseroles made of cooked ingredients are usually baked uncovered. If you like a crisper, browner top, be sure the casserole is uncovered for at least part of the bake time.

Is it better to cook casserole the day before or? ›

Make-ahead meals (especially baked casseroles) are terrific because you can completely assemble them in advance and bake them just before serving. They're the ultimate comfort food as they come bubbling hot and delicious straight from the oven to the table to the delight of family and friends.

Can I put a cold casserole dish in the oven? ›

In the case of casseroles, leftovers should actually never be added to a preheated oven. The reason is simple: the cold casserole dish may crack.

Can you leave egg casserole out overnight? ›

Cooked eggs and egg dishes may be refrigerated for serving later but should be thoroughly reheated to 165° F before serving. Never leave cooked eggs or egg dishes out of the refrigerator for more than 2 hours or for more than 1 hour when temperatures are above 90° F.

What is good to serve with breakfast casserole? ›

It can be made for breakfast, lunch, or dinner.

Serve it with some sliced fresh fruit on the side for breakfast, or if making for dinner, a green salad. If you omit the veggies in the casserole, consider serving some sautéed vegetables on the side. Or if leaving out the meat, some crispy bacon or cooked sausages.

How do you know when breakfast casserole is done? ›

To check if your egg casserole is done, you can insert a knife into it, and if it comes out clean and the casserole has set in the middle, then you can pull it out of the oven. As a quick tip, if it happens to be browning quickly, you can cover it with a piece of foil for the last minute of baking.

Why is my breakfast casserole soupy? ›

Why Is My Breakfast Casserole Runny? The key to a breakfast casserole that is moist and delicious but not runny is to make sure you have the proper ratio of bread, eggs, and milk. If there is too much liquid for the bread to absorb, the result could be a runny casserole.

Should casseroles be cooked before freezing? ›

If your casserole contains ingredients that don't freeze well, like mashed potatoes, then it may not be a good candidate. If your casserole has raw protein, like chicken or shrimp, make sure to bake it and cool it completely before freezing.

Is it better to freeze cooked or uncooked? ›

Cooked meat doesn't maintain its quality in the freezer for as long as raw meat does: Cooked poultry and fish can be kept in the freezer for four to six months, while beef, veal, lamb and pork shouldn't be kept for longer than two to three months.

How to freeze and reheat breakfast casserole? ›

Baked casserole may be frozen, up to 2 months. Thaw in refrigerator overnight and bake at 350ºF (177ºC) for about 20 minutes or until heated through. To freeze this casserole: you can freeze unbaked casserole up to 2 months. Cover very tightly with plastic wrap and foil.

Can you freeze hashbrown casserole before baking? ›

You can freeze the hashbrown casserole, either before baking it or after it has been baked and cooled. Cover tightly with plastic wrap and foil and freeze for up to 3 months. Thaw in the refrigerator before baking or reheating in the oven.

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