A simple, protein-rich egg casserole loaded with cottage cheese, colorful bell peppers, spinach, and melty cheddar. Perfect for breakfast or brunch with family and friends.
Preheat oven to 375℉ and lightly grease a 9x13-inch baking dish.
In a large mixing bowl, whisk together eggs, cottage cheese, milk, salt, black pepper, garlic powder, and onion powder until well combined. If your cottage cheese looks watery, give it a quick drain through a fine mesh strainer first. Pat the diced bell peppers dry with a paper towel to remove excess moisture.
Stir in the shredded cheddar, bell peppers, and spinach. Pour the mixture into the prepared dish, spreading evenly.
Bake for 40–45 minutes, or until the eggs are set and the top is lightly golden.
Let the casserole cool for a few minutes before slicing. Garnish with chopped green onions and serve warm.
Notes
Season well: for a casserole this size, 1½–2 teaspoons of kosher salt and 1 teaspoon of black pepper is the right range. Underseasoned eggs taste flat once baked, so don't be shy.
If using low-fat cottage cheese, drain it briefly through a fine mesh strainer before mixing. Full-fat holds together well and needs no draining.
Pat the diced bell peppers dry with a paper towel before adding them to the bowl. This prevents a watery bottom after baking.
If using fresh spinach, squeeze out any excess moisture before adding. If using frozen, thaw completely and squeeze very well. This step makes a real difference in the final texture.
If using 16 eggs, start checking for doneness at 45 minutes. Add 5-8 more minutes if the center still has jiggle. Insert a knife in the center. It should come out clean or with just slight moisture, no raw egg.
For extra heat, add ½ teaspoon crushed red pepper flakes or diced jalapeños.
Swap cheddar for Monterey Jack or mozzarella if you prefer a milder flavor.
Make-ahead: assemble the night before, cover tightly, and refrigerate. Let it sit at room temperature for 15-20 minutes while the oven preheats, then bake as directed.
Meal prep: cool completely, slice, and store in the fridge for up to 4 days. Reheat in the microwave or oven.