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Heat the oven before using. Heat the oven to 350°F (175°C) before using. Put oil or butter on a baking dish that measures 9 by 13 inches.
Prepare cheese sauce: Mix together mayonnaise, sour cream, cheddar cheese, mozzarella cheese, garlic powder, onion powder, and black pepper in a medium-sized bowl. Mix well.
Prepare the meal: Pour the cheese mixture over the onion rings in the baking dish.
Cook in the oven. Bake in preheated oven for 30-35 minutes, or until onions are tender and cheese is bubbly and golden brown.
Add decoration and serve. If you want, add some chopped parsley on top. Serve the food hot.