Go Back
+ servings
wooden spoon in the white breakfast casserole dish

Vegetarian Hashbrown Breakfast Casserole

This easy hashbrown spinach egg casserole is the perfect make ahead breakfast for a holiday morning!
Course Breakfast
Cuisine American
Keyword healthy breakfast casserole
Prep Time 10 minutes
Cook Time 40 minutes
Total Time 50 minutes
Servings 8 people
Calories 217kcal


  • 1 20 ounce bag frozen hashbrowns
  • ½ cup sweet onion, diced
  • 1 medium red bell pepper, diced
  • 5 ounces spinach, steamed
  • 8 large eggs
  • 1 ⅓ cup milk
  • 1 tsp garlic powder
  • 1 tsp coarse salt
  • 1/2 tsp black pepper
  • 1 cup shredded cheddar cheese, divided
  • olive oil spray


  • Preheat oven to 350 F.
  • Layer the hashbrowns, red bell pepper, onion, and spinach and half the cheese (if using) in a 9 x 13 inch casserole dish.
  • Whisk the eggs, milk, garlic powder, salt, and pepper in a bowl. Pour evenly over vegetable mixture. Top with the rest of the cheese (if using).
  • Bake 50 - 60 minutes, until the center is cooked through and the cheese is golden (if using). Serve warm.



Frozen hashbrowns. I used plain frozen hashbrowns and didn't unthaw them. You can also use seasoned hashbrowns - just adjust the seasonings to taste.
Spinach. I like using spinach or any quick-cooking green in this recipe. I recommend steaming fresh spinach either on top of the stove or in the microwave.
You can also use frozen spinach. Be sure to thaw and drain it completely before adding to the casserole.
Bell peppers. Feel free to swap in any bell pepper. I like the red bell pepper for the color and hint of sweetness but other colors work great.
If you are not using cheese, increase the salt by up to ½ teaspoon. 
You can add paprika, onion powder, or other dried herbs such as oregano to the egg mixture. 


Calories: 217kcal | Carbohydrates: 18g | Protein: 13g | Fat: 10g | Saturated Fat: 5g | Cholesterol: 203mg | Sodium: 498mg | Potassium: 491mg | Fiber: 2g | Sugar: 4g | Vitamin A: 2616IU | Vitamin C: 30mg | Calcium: 206mg | Iron: 2mg