Preheat the Oven – Set oven to 350°F (175°C) and grease a 9x13-inch baking dish.
Prepare the Egg Mixture – In a large bowl, whisk together eggs and cottage cheese until smooth.
Add Vegetables and Seasoning – Stir in onion, spinach, tomatoes, zucchini, ¾ cup Parmesan cheese, garlic powder, salt, and black pepper. Mix well.
Pour into Baking Dish – Spread the mixture evenly into the greased dish and sprinkle the remaining Parmesan cheese on top.
Bake – Place in the oven and bake for 30-35 minutes, or until the center is set and the top is golden brown.
Serve and Enjoy – Let cool for a few minutes, then slice and serve warm.