Crustless Zucchini Pie

Preheat oven to 400 F. Spray a small 8 x 8 pan with cooking spray.

In a skillet over medium heat saute the onions, mushrooms and zucchini until the onions just become softened and the mushrooms are beginning to cook through. Remove from heat and spoon the mixture in the bottom of the baking dish. Sprinkle the cheese over the mixture and stir to evenly distribute the cheese throughout the zucchini mixture. Slice tomatoes and place on top of the zucchini/cheese mixture. Sprinkle salt and pepper on top. Bake in the preheated oven for 20-25 minutes until bubbly hot and it starts to turn golden brown.