Preheat the oven to 350 F. In a medium-sized bowl, combine the eggs, Parmesan cheese, vegetable oil, parsley, garlic powder, mustard powder, salt, and pepper. Mix until well combined.

Mix in the sliced zucchini, chopped onion and bell peppers, and Bisquick mix.

Place mixture in a greased pie baking dish and bake for 30 mins or until golden brown on top.