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Export 7 ingredients for grocery delivery
Step 1
Preheat the oven to 350 degrees F (175 degrees C). Spray a casserole dish with cooking spray.
Step 2
Combine yellow squash, cream of mushroom soup, Cheddar cheese, mayonnaise, onion, egg, salt, and pepper in a bowl. Mix until well combined and transfer to the casserole dish and cover with foil.
Step 3
Bake in the preheated oven until cooked through and bubbly, about 45 minutes.