Preheat the oven to 375 degrees Fahrenheit and spray a 9x9 baking dish with oil (such as avocado oil spray).
Heat olive oil in a medium skillet. Add diced peppers and onions and cook together on medium low heat for a few minutes to soften, stirring often.
Turn the heat to low, ddd chopped baby spinach, cover with a lid and leave it for about a minute. Open the lid and stir until spinach is just wilted. Turn off the heat and set aside.
Crack all 8 eggs into a large or medium bowl and add ¾ cup cottage cheese, salt, pepper and garlic powder. Whisk vigorously until incorporated.
Now add the cooked veggies and mozzarella cheese and mix together with a spoon.
Transfer the egg mixture into the prepared 9x9 dish.
Bake uncovered for 25-30 minutes in preheated oven. The top should be set and the edges slightly brown.
Cut into 9 squares and serve hot or at room temperature.