5 from 3 votes

Spinach Mushroom Egg Casserole

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This baked egg casserole with spinach and mushrooms is a healthier alternative to sweet breakfast dessert casseroles like my ultimate blueberry breakfast bake. Savory and oh-so-good, the combined sausage, cream of mushroom soup, spinach,  mushrooms and cheese really make this breakfast recipe taste delicious enough for dinner.

Spinach Mushroom Breakfast Casserole Recipe JUST OUT OF THE OVEN

 

With all the savory and sweet breakfast casseroles out there that smash in the carb loaded hash browns or the sweet French toast, I wanted to add little more savory experience for holiday mornings. This breakfast casserole, which is fully loaded with cheese, spinach, and mushrooms, is a great egg bake recipe that anyone that loves these veggies will truly enjoy. In fact, one of my readers said “THIS WAS SO GOOD” and I hope you feel the same way!

Breakfast Egg Casserole with Spinach

Before you get started on this casserole, please know there is some pre-prep work – cook and drain pork sausage first and then the recipe is ready to be assembled. This breakfast casserole (like most) takes about 55-60 minutes to cook, therefore cooking times need to be planned ahead. 

Breakfast Casserole Ingredients

  • 10 ounces seasoned croutons
  • 1lb ground pork sausage, cooked and crumbled
  • 6 large eggs
  • 2-1/4 cups milk
  • 1 can, 10.5 oz. cream of mushroom soup
  • 1 package, 10 oz. frozen spinach, thawed
  • 8 oz. sliced fresh mushrooms
  • 2 cups shredded cheese – Monterey jack or Cheddar Jack
  • salt and black pepper

Overnight Egg Bake Recipe Questions

Does this casserole recipe with spinach have to be made the night before? No, but it CAN be prepped overnight. Please see recipe card for the instructions. 

Does the spinach need to be drained of excess moisture?  Nope! Do not drain thawed spinach, or squeeze any water out of it. Some recipes (like spinach dip) require that but this breakfast bake does not. 

Can I make breakfast casserole ahead of time and can this baked egg casserole be made ahead? Yes and yes! Many breakfast casseroles are set up to easily be prepped ahead of time and this one is no exception. Simply prep your entire casserole, cover well with foil, and place in fridge till baking the next day. Remove foil prior to baking. As with all make ahead recipes, the recipe may take a bit longer in the oven as the recipe has to come up from very cold ingredients to cooking temp before bakes. 

Is this spinach egg bake the same as a spinach casserole? No, If you are looking for spinach casserole side dish, its very different. 

Can pork sausage be substituted for other proteins? If you do not like breakfast sausage, feel free to use hamburger beef.

Are there any other cheese alternatives? Cheese is something that can be really specific for people but no worries – any shredded cheese (cheddar cheese, Monterey Jack, Pepper Jack, Cheddar Jack) all work great. 

What other ingredients can go in a breakfast casserole? This spinach mushroom casserole is really specific in flavoring, so I personally do not choose to add much to it, although if you are an onion person, a half cup of diced onions would go just fine. Just put in with the spinach mixture (at the same time) before dumping onto sausage. 

Easy Spinach Breakfast Casserole Recipe

Grease a 9×13 baking dish with nonstick cooking spray.

Spread croutons into the bottom of the pan.

croutons in a baking dish as the bottom layer

Sprinkle cooked and crumbled sausage on top of croutons.

pork sausage cooked and layered on croutons

In a large bowl, add eggs, milk and cream of mushroom soup and whisk eggs well.

Fold in thawed but not drained spinach and  sliced mushrooms.

add sliced mushrooms into egg mixture

Mix all ingredients together well.

Add shredded cheese and mix again.

Pour spinach and egg mixture on top of croutons and sausage in the baking dish.

Pour spinach mixture onto croutons and sausage

Bake spinach casserole at 325 for 50-55 minutes (see note about timing for overnight casserole). 

uncooked egg breakfast casserole

Remove dish from oven.

full spinach breakfast casserole hot out of the oven with cheese

Let casserole stand for 5 minutes before slicing and serving.

Serves approximately 12 slices.

slice of spinach mushroom egg bake

 

 

As a side note, you may notice two kinds of images in this recipe (one clear casserole dish and one blue one). This is because we made it two separate times and updated the images to best show you the step.

Your changes and feedback are always welcome and we love if you leave comments on your own alterations so we can try them as well.

Much love,

~Trisha & Char

5 from 3 votes

Spinach Mushroom Egg Casserole


Prep Time 20 minutes
Cook Time 55 minutes
Total Time 1 hour 15 minutes
Breakfast casserole with spinach, mushrooms and eggs - a hearty, savory and delicious breakfast egg bake that is lick your lips good!

Ingredients
 

  • 10 ounces seasoned croutons
  • 1 lb ground pork sausage cooked and crumbled
  • 6 eggs
  • 2-1/4 cups milk
  • 1 can 10.5 oz. cream of mushroom soup
  • 1 package 10 oz. frozen spinach, thawed
  • 8 oz. sliced fresh mushrooms
  • 2 cups shredded Monterey jack
  • salt and pepper

Instructions

  • Grease a 9x13 baking pan with nonstick cooking spray.
  • Cook sausage and drain of excess grease.
  • Spread croutons into the bottom of the pan. Sprinkle sausage on top.
  • Add eggs, milk and cream of mushroom soup to a bowl and whisk well.
  • Fold in thawed but not drained spinach and sliced mushrooms. Mix egg mixture well.
  • Add shredded cheese and mix well.
  • Pour cheesy spinach mixture on top of croutons and sausage.
  • Cover and refrigerate overnight.
  • The next day, bake at 325 for 50-55 minutes.
  • Remove from oven.
  • Let stand for 5 minutes before slicing and serving (this process is necessary to avoid the casserole breaking apart)

Overnight Egg Bake with Spinach & Mushrooms

  • Grease a 9x13 baking pan with nonstick cooking spray.
  • Cook pork sausage and drain of excess grease.
  • Spread croutons into the bottom of the pan. Sprinkle sausage on top.
  • Add eggs, milk and cream of mushroom soup to a bowl and whisk well.
  • Fold in thawed but not drained spinach and sliced mushrooms. Mix egg mixture well.
  • Add shredded cheese and mix well.
  • Pour cheesy spinach mixture on top of croutons and sausage.
  • Cover with foil and refrigerate overnight.
  • The next day, REMOVE FOIL and bake at 325 for 55-60 minutes, a little longer if necessary. When you overnight a casserole, the ingredients get extra cold and often need an extra 5-10 minutes of baking time.
  • Remove casserole from oven.
  • Let stand for 5 minutes before slicing and serving.

Video

Notes

  • Note that this egg casserole has cheese in it so you cannot use a knife test to test for doneness.

Nutrition

Serving: 1 | Calories: 162kcal | Carbohydrates: 2g | Protein: 9g | Fat: 13g | Saturated Fat: 4g | Polyunsaturated Fat: 2g | Monounsaturated Fat: 5g | Trans Fat: 1g | Cholesterol: 110mg | Sodium: 276mg | Potassium: 143mg | Fiber: 1g | Sugar: 1g | Vitamin A: 164IU | Vitamin C: 1mg | Calcium: 28mg | Iron: 1mg

Nutritional Disclaimer: The nutritional data provided here is auto-calculated and intended for your convenience only. As it’s generated via automation, its accuracy may be compromised. For precise nutritional insight, please compute the values utilizing the actual ingredients in your recipe through your chosen nutrition calculator or application.

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5 from 3 votes

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