Preheat oven to 350 degrees F (175 degrees C). Grease a 2 quart casserole dish.
In a large bowl mix together the zucchini, onion, eggs, oil, muffin mix/cornbread recipe, salt and pepper. Stir in the cheese and bacon, reserving some for the top if you'd like. Spread this mixture into a greased 2 quart casserole dish; top with remaining cheese and bacon.
Bake in a preheated oven for 60 minutes.
Note: Do not add milk or other liquid other than the eggs, the zucchini supplies enough.