01 - Preheat oven to 375°F. Grease a 9x9-inch baking dish with olive oil or nonstick cooking spray, ensuring even coverage on the bottom and sides.
02 - In a large mixing bowl, whisk together the eggs and cottage cheese until the mixture is smooth and free of large curds.
03 - Add the shredded chicken or turkey sausage, cheddar cheese, spinach, bell peppers, red onion, salt, black pepper, garlic powder, and smoked paprika. Stir until all ingredients are evenly distributed throughout the egg mixture.
04 - Pour the egg mixture into the prepared baking dish, spreading it into an even layer with a spatula.
05 - Bake for 35 minutes, or until the center is fully set and no longer jiggles, and the top is lightly golden brown.
06 - Remove from the oven and let the casserole rest for 5 minutes before slicing into portions and serving.