Fill 8 x 8 inch casserole dish half full of sliced zucchini. Sprinkle lightly with salt and pepper. Slice 2 or more tomatoes, enough to cover zucchini as a layer. Sprinkle with oregano - 1/2 teaspoon. Slice 1 large onion on top of tomatoes as another layer. Top with 3/4 cup of Mozzarella cheese. Cover cheese with bacon strips.

Bake in 350 degree oven for 30 minutes. Remove from oven and pour off liquid by tipping up dish in corner. Return to oven and bake another 30 minutes or so. When bacon is brown, use kitchen shears to cut through bacon and cheese before serving. This is my sister's recipe - very good.