In a round 9-inch pie dish (2 1/2 inches high)
alternate the slices of zucchini, squash, onion and pepper and stack them on end circling around the outer edge of the pie plate and finishing in the center.
Lay any remaining ingredients on top.
Top with 1 cup marinara sauce.
oregano and garlic powder.
Add on mozzarella cheese.
Shake on some salt and pepper.
Bake 350 degrees 30 minutes, then broil cheese for 2 min on high until lightly brown cheese