Vegetarian Potato and Squash Casserole

By Amy

4.67 / 5

20min

1h

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cooking spray
2 baking potatoes cut into 1/2-inch slices
salt and ground black pepper to taste
3 large yellow summer squash cut into 1/2-inch slices
4 large tomatoes cut into 1/2-inch slices
1 sweet onion cut into 1/4-inch slices
2 tablespoons butter