squash, zucchini and tomato bake

1 squash
1 zucchini
1 tomato
1/4 cup onion- red or white
1/2 cup cheese

Slice squash and zucchini and chop onion and tomato. Put in a casserole dish. Cover with plastic wrap poke with a fork and microwave for 10-15 minutes or until tender. You can also bake it in the oven at 350 for 30 minutes or until tender. Cover with cheese and let melt.