Spinach Mushroom Breakfast Casserole Recipe

A delicious breakfast casserole is the perfect way to start your day, especially when it combines the earthy flavors of spinach and mushrooms with a hearty egg base. This Spinach Mushroom Breakfast Casserole is a versatile dish that works beautifully for busy mornings, brunch gatherings, or meal prepping for the week. Packed with wholesome ingredients, it’s as nutritious as it is satisfying, offering protein, fiber, and vibrant flavors in every bite.

Why You’ll Love This Recipe

1. Easy to Make: Requires minimal prep time and uses simple ingredients.
2. Perfect for Meal Prep: Make it ahead of time and enjoy a quick, ready-to-go breakfast.
3. Customizable: Adapt the recipe to include your favorite vegetables, meats, or cheeses.
4. Healthy and Filling: A nutrient-rich dish that keeps you energized all morning.

Step-by-Step Instructions

Step 1: Prepare the Vegetables

1. Heat a large skillet over medium heat and add a drizzle of olive oil.
2. Sauté the onions until they are soft and translucent, about 3–4 minutes.
3. Add the mushrooms and cook for another 5–7 minutes until they release their moisture and begin to brown.
4. Toss in the chopped spinach and cook for 1–2 minutes until wilted. Remove from heat and set aside.

Step 2: Whisk the Egg Mixture

1. In a large mixing bowl, whisk together the eggs and milk until well combined.
2. Stir in the garlic powder, paprika, salt, black pepper, and red pepper flakes (if using).

Step 3: Assemble the Casserole

1. Preheat your oven to 375°F (190°C). Grease a 9×13-inch baking dish with non-stick spray or butter.
2. Spread the sautéed vegetables evenly in the bottom of the dish.
3. If using breadcrumbs or cubed bread, sprinkle them over the vegetables.
4. Pour the egg mixture evenly over the top.
5. Sprinkle shredded cheese and feta (if using) across the casserole. Add crumbled sausage or bacon for extra protein, if desired.

Step 4: Bake the Casserole

1. Place the casserole dish in the preheated oven and bake for 30–35 minutes, or until the eggs are set and the top is golden brown.
2. To check doneness, insert a knife into the center of the casserole—it should come out clean.

Step 5: Rest and Serve

1. Allow the casserole to cool for 5–10 minutes before slicing.
2. Garnish with fresh herbs like parsley or chives for a burst of color and flavor.
3. Serve warm and enjoy!

Tips for Success

1. Drain Excess Liquid: Mushrooms and spinach release water when cooked. Make sure to cook them thoroughly to avoid a watery casserole.
2. Use Fresh or Frozen Spinach: If using frozen spinach, thaw and squeeze out any excess moisture before adding it to the dish.
3. Customize Your Veggies: Add diced zucchini, cherry tomatoes, or shredded carrots for extra nutrition.
4. Layer Evenly: Spread ingredients evenly in the dish to ensure every bite has a balanced mix of flavors.
5. Make It Ahead: Prep the casserole the night before, cover, and refrigerate. Bake it fresh in the morning for a hassle-free breakfast.

Variations

Gluten-Free

• Skip the breadcrumbs or use gluten-free alternatives.

Dairy-Free

• Substitute milk with almond, oat, or coconut milk, and use dairy-free cheese.

Vegetarian

• Omit meat and add extra veggies like roasted sweet potatoes or peppers.

Keto-Friendly

• Leave out the breadcrumbs and ensure your milk choice is low-carb.

Serving Suggestions

• As-Is: A perfect standalone dish packed with flavor and nutrients.
• With Sides: Pair with fresh fruit, yogurt, or a slice of whole-grain toast.
• For Brunch: Serve alongside a light salad, roasted potatoes, or mimosas for a crowd-pleasing spread.

Frequently Asked Questions

Can I make this casserole ahead of time?

Yes! You can assemble the casserole the night before and refrigerate it. Bake it fresh in the morning for the best results.

Can I use egg whites instead of whole eggs?

Absolutely! Substitute 2 egg whites for each whole egg to reduce cholesterol and fat content.

What kind of cheese works best?

Cheddar, mozzarella, or a blend of Italian cheeses are all excellent choices. For a unique twist, try Swiss or Gruyere.

Can I add meat?

Yes! Cooked bacon, sausage, or diced ham can be mixed into the casserole for added protein and flavor.

Conclusion

This Spinach Mushroom Breakfast Casserole is a delicious and nutritious way to kick off your day. Whether you’re hosting brunch or prepping for busy mornings, this dish is a flavorful, versatile option that’s sure to satisfy. With its creamy egg base, savory vegetables, and melty cheese, it’s a crowd-pleaser you’ll return to again and again.

Yield: 6

Spinach Mushroom Breakfast Casserole Recipe

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A delicious breakfast casserole is the perfect way to start your day, especially when it combines the earthy flavors of spinach and mushrooms with a hearty egg base. This Spinach Mushroom Breakfast Casserole is a versatile dish that works beautifully for busy mornings, brunch gatherings, or meal prepping for the week. Packed with wholesome ingredients, it’s as nutritious as it is satisfying, offering protein, fiber, and vibrant flavors in every bite.

Prep Time 15 minutes

Cook Time 40 minutes

Total Time 55 minutes

Ingredients

• 2 tablespoons olive oil
• 1 cup mushrooms, sliced
• 2 cups fresh spinach, roughly chopped
• 1 small onion, finely chopped
• 1 red bell pepper, diced
• 8 large eggs
• 1/2 cup milk (dairy or plant-based)
• 1 cup shredded cheese (cheddar, mozzarella, or a mix)
• 1/2 teaspoon garlic powder
• 1/2 teaspoon smoked paprika
• 1/2 teaspoon salt
• 1/4 teaspoon black pepper

Instructions

1. Preheat the Oven

• Preheat your oven to 375°F (190°C).
• Lightly grease an 8x8-inch baking dish or a similar-sized casserole dish.

2. Sauté the Vegetables

1. Heat olive oil in a skillet over medium heat.
2. Add the onions and bell peppers, cooking for 3–4 minutes until softened.
3. Add the mushrooms and cook for another 5 minutes until tender.
4. Stir in the spinach and cook for 1–2 minutes until wilted. Remove from heat and set aside.

3. Prepare the Egg Mixture

1. In a large bowl, whisk together the eggs, milk, garlic powder, smoked paprika, salt, and black pepper.
2. Stir in half of the shredded cheese.

4. Assemble the Casserole

1. Spread the sautéed vegetables evenly in the greased baking dish.
2. Pour the egg mixture over the vegetables, ensuring everything is well-covered.
3. Sprinkle the remaining cheese evenly on top.

5. Bake the Casserole

1. Place the casserole dish in the preheated oven.
2. Bake for 35–40 minutes, or until the eggs are set and the top is golden brown.
3. Let the casserole cool for 5 minutes before slicing and serving.

Notes

• Customize the vegetables: Add diced zucchini, cherry tomatoes, or broccoli for extra variety.
• Make it meaty: Add cooked sausage, bacon, or diced ham for a heartier dish.
• Dairy-free option: Use plant-based milk and a dairy-free cheese alternative.