Heat oven to 400°F.

Grease a #9-inch pie plate{}.

Layer chopped @zucchini{1%cup}, chopped @tomato{1%large}, @onion{1%medium}, and @Parmesan cheese{1/3%cup}. Stir @reduced-fat Bisquick{1/2%cup}, @fat-free milk{1%cup}, @egg substitute{1/2%cup}, @salt{} and @pepper{} to taste until blended, then pour into pie plate.

Bake for ~{35%minutes}.