Cheesy Fiesta Casserole

Prep: 15 min Cook: 38 min Serves: 8 Cuisine: Mexican

A hearty cheesy casserole combining sausage, mushrooms, and eggs, topped with flavorful cheeses and salsa, perfect for a satisfying breakfast or brunch gathering.

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Ingredients

  • 1 lb. bulk sausage
  • 1/4 lb. fresh mushrooms, chopped
  • 1 medium onion, finely chopped
  • 8 to 10 eggs
  • 4 Tbsp. sour cream
  • salt and pepper to taste
  • 8 Tbsp. salsa
  • 2 c. (8 oz.) Cheddar cheese, grated
  • 2 c. (8 oz.) Mozzarella, grated
  • 2 c. (8 oz.) Mexican process cheese loaf, grated

Instructions

  1. Saute sausage, mushrooms, and onion in a large skillet until sausage is completely cooked.
  2. Drain well; set aside.
  3. Combine eggs and sour cream in a blender; season with salt and pepper. Whip eggs for 1 minute.
  4. Pour the egg mixture into a greased 9 x 13-inch baking dish.
  5. Bake at 400°F (200°C) until eggs are softly set, about 5 to 8 minutes.
  6. Spoon salsa evenly over the top of the eggs, then spread the sausage mixture over the salsa.
  7. Top with grated Cheddar, Mozzarella, and Mexican process cheese loaf.
  8. Cover and refrigerate until 30 minutes before serving.
  9. Bake at 325°F (160°C) until cheeses are melted, about 30 minutes.

Tips & Substitutions

For a lighter version, substitute turkey sausage for the bulk sausage. You can add bell peppers or spinach for extra veggies. If you prefer a spicier kick, use spicy salsa or add jalapeños to the sausage mixture. This dish can be made ahead and stored in the fridge before baking, making it a great option for meal prep or serving at brunch alongside South Of The Border Breakfast.

Serving Suggestions

Serve this casserole with a side of fresh fruit or a simple green salad for a balanced meal. It pairs wonderfully with Terry'S Mexican Layered Dip for a festive brunch spread. Consider offering avocado slices or guacamole on the side, as they complement the flavors and add creaminess to each bite.

Storage & Reheating

Leftovers can be stored in an airtight container in the refrigerator for up to 3 days. To reheat, cover with foil and bake in a 325°F oven until warmed through, about 15-20 minutes. You can also microwave individual portions, but be careful not to overcook, as the eggs can become rubbery.

Nutrition & Diet Analysis (per serving)

Each serving of Cheesy Fiesta Casserole contains roughly 671 calories, with 20g protein, 101g carbohydrates, and 22g fat. It is an excellent source of calcium (42% of the Daily Value), protein (40% of the Daily Value), and vitamin A (21% of the Daily Value), and a good source of potassium and iron. Note that it is relatively high in sodium, at 2071mg per serving (90% of the Daily Value).

671 kcal 34% DV
Protein Fat Carbs

Macronutrients

Protein 20.2g 40% DV
Total Fat 21.5g 28% DV
Carbs 101g 37% DV
Fiber 0.6g 2% DV
Sugar 2.6g 5% DV

Electrolytes

Sodium 2071.2mg 90% DV
Potassium 819.9mg 17% DV
Cholesterol 298.5mg 100% DV

Vitamins & Minerals

Vitamin A 186.4mcg 21% DV
Vitamin C 1.1mg 1% DV
Vitamin D 0.4mcg 2% DV
Calcium 545.9mg 42% DV
Iron 2.4mg 13% DV
Diet fit High-protein Low-fat
Contains Milk Egg

Estimated from ingredients & per-serving nutrition — verify against package labels for allergies or strict diets.

* % Daily Values based on a 2,000 calorie diet (FDA 2020).

Frequently Asked Questions

Can I make Cheesy Fiesta Casserole ahead of time?

Yes, you can prepare the casserole the night before. Just assemble it up to the point of baking, cover it tightly with plastic wrap, and refrigerate. Remove it from the fridge about 30 minutes before baking to allow it to come to room temperature, then bake as directed.

What can I substitute for the cheeses in the recipe?

You can use any combination of cheeses you prefer, such as Monterey Jack or Pepper Jack for a bit of heat. For a lower-fat option, consider using reduced-fat cheese. Just keep in mind that the texture and flavor may vary slightly based on your choices.

Can I freeze Cheesy Fiesta Casserole?

Yes, this casserole can be frozen before baking. Wrap it tightly with plastic wrap and then foil to prevent freezer burn. When ready to bake, thaw it in the refrigerator overnight, then bake as directed. It’s a great meal prep option for busy days!

Nutrition is estimated from USDA FoodData Central ingredient data and may vary with brand, portion and preparation — see our methodology. This information is for general educational purposes only and is not medical or dietary advice (disclaimer).

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