Instructions: Saute diced onion and minced garlic in hot oil in a large skillet over medium-high heat; add chopped tomato and next 4 ingredients, and saute until zucchini is tender. Drain and set aside.

Arrange bread slices in the bottom of a lightly greased 13- by 9-inch baking dish.

Whisk together egg substitute and next 4 ingredients; pour over bread slices. Top with tomato mixture, and sprinkle with cheeses. Cover and chill 8 hours.

Let stand at room temperature 30 minutes before baking.

Bake casserole at 350 degrees for 50 minutes or until lightly browned and puffed.

This recipe yields 8 servings.

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