Directions
- Preheat the oven.
Set the oven to 350°F (175°C) and lightly grease a 9×13-inch baking dish with oil or butter. - Prepare the onions.
Slice the sweet onions into 1/4-inch rings and arrange them evenly in the prepared baking dish. - Make the cheese sauce.
In a medium bowl, combine mayonnaise, sour cream, cheddar cheese, mozzarella cheese, garlic powder, onion powder, and black pepper. Mix until smooth and well incorporated. - Assemble the casserole.
Pour the cheese mixture evenly over the onion rings, ensuring all rings are coated. - Prepare the topping.
Mix the crushed Ritz crackers with melted butter, then sprinkle evenly over the cheese-covered onions. - Bake.
Place the dish in the preheated oven and bake for 30–35 minutes, or until the onions are tender and the cheese is bubbly and golden brown. - Garnish and serve.
Sprinkle with chopped parsley if desired and serve hot.
Recipe Details
- Prep Time: 15 minutes
- Cook Time: 35 minutes
- Total Time: 50 minutes
- Servings: 6–8
- Difficulty: Easy
Serving Suggestions
Serve this cheesy onion casserole as a side dish with roast chicken, steak, or a hearty vegetarian main. It also works beautifully for potlucks or family gatherings, as it’s easy to portion and loved by all ages.
Storage Tips
Cool leftovers completely and store in an airtight container in the fridge for 2–3 days. Reheat in the oven at 350°F (175°C) for 10–12 minutes until warmed through. Freezing is not recommended, as the texture of the cheese sauce may change.
Optional Variations
- Cheese swap: Try Gruyère or Monterey Jack for a slightly different flavor profile.
- Add herbs: Mix in fresh thyme or rosemary for a fragrant twist.
- Spicy version: Add 1/4 teaspoon of cayenne pepper or red pepper flakes to the cheese sauce.
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