You are here: Home » Recipes » Summer Squash Casserole Summer Squash Casserole Recipe by Favorite Recipes Press Yield 6 servings A quick-and-easy summer squash casserole that is a snap to put together. PrintEmail Ingredients 4 -- fresh yellow squash, sliced1 can onion rings4 large tomatoes1/2 stick margarine, melted1/4 teaspoon salt Instructions Layer in a 9 x 13-inch casserole sliced squash, 1/2 can onion rings and sliced tomatoes. Repeat. Pour melted margarine over layers and sprinkle with salt. Cover with foil and bake at 350F for 1 hour. Recipe reprinted with permission from Debbye Dabbs’ Take Five: A Light Cookbook (D.D. Publishing 1993).