Make cheese sauce: Combine mayonnaise, sour cream, cheddar cheese, mozzarella cheese, garlic powder, onion powder, and black pepper in a medium bowl. Stir until well combined.
Assemble dish: Pour cheese mixture over onion rings in baking dish.
Add topping: Mix crushed Ritz crackers with melted butter. Sprinkle over onion and cheese mixture.
Bake: Bake in preheated oven for 30-35 minutes, or until onions are tender and cheese is bubbly and golden brown.
Garnish and serve: If desired, garnish with chopped parsley. Serve hot.
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