Set your oven to 375°F (190°C) and prepare a 9×13-inch baking pan by coating it lightly with non-stick spray or butter.
In a spacious bowl, break the eggs and whisk them until smooth and uniform.
Blend the cottage cheese into the eggs until the mixture is consistent.
Incorporate the shredded cheddar cheese, diced bell peppers, chopped spinach, onions, and cooked bacon or sausage if you chose to add it. Season everything with salt, black pepper, and garlic powder. Stir thoroughly so all elements are well mixed.
Transfer the mixture into the greased baking dish, spreading it evenly with a spatula.
Place the dish in the oven and bake for around 35 to 40 minutes, checking for a golden top and firm center; use a knife test to ensure it comes out clean.
Take the casserole out of the oven and allow it to cool for about 5 minutes before you cut into slices and serve.