Preheat oven to 190°C (375°F) and grease a 20x20cm baking dish.
In a large bowl, whisk the eggs then fold in the cottage cheese, garlic powder, salt, and pepper.
Stir in the chopped spinach, grated zucchini, and diced bell pepper until evenly distributed.
Sift in the flour and mix until the batter is cohesive.
Transfer the mixture into the prepared baking dish and smooth the top.
Sprinkle the shredded cheddar cheese evenly over the surface.
Bake for 40 to 45 minutes, or until the center is set and the top is golden brown.
Let stand for 10 minutes before slicing and serving.