Cheesy Baked Onion Casserole — Rich, Creamy, and Comforting

Directions

1. Preheat the oven: Set your oven to 175°C (350°F). Grease a 9×13-inch (23×33 cm) baking dish with oil or butter.
2. Prepare the onions: Slice the onions into ¼-inch rings and layer them evenly in the prepared baking dish.
3. Make the cheese sauce: In a medium bowl, combine mayonnaise, sour cream, cheddar, mozzarella, garlic powder, onion powder, and black pepper. Mix until smooth and well blended.
4. Assemble the casserole: Pour the cheese mixture evenly over the sliced onions, spreading gently to coat all layers.
5. Add the topping: In a small bowl, combine crushed Ritz crackers with melted butter. Sprinkle the mixture evenly over the top of the casserole.
6. 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.
7. Garnish and serve: Optionally, sprinkle chopped parsley over the top for a fresh, colorful finish. Serve hot.

Recipe Details

Prep time: 15 minutes
Cook time: 30–35 minutes
Total time: 45–50 minutes
Servings: 6–8
Difficulty: Easy

Variations & Substitutions

• Cheese swaps: Use Gruyère or Monterey Jack for a different flavor profile.
• Dairy-free option: Substitute vegan mayonnaise, sour cream, and cheese alternatives.
• Extra flavor: Add ½ teaspoon smoked paprika or a pinch of cayenne for a subtle kick.
• Breadcrumb topping: Replace Ritz crackers with panko breadcrumbs for an extra-crispy finish.

Serving Suggestions