Cheesy Baked Onion Casserole

Directions

Step 1: Preheat the Oven

Preheat your oven to 350°F (175°C). Lightly grease a 9×13-inch baking dish with butter or oil.

Step 2: Prepare the Onions

Slice the onions into ¼-inch thick rings and layer them evenly in the prepared baking dish.

Step 3: Make the Cheese Sauce

In a medium bowl, combine mayonnaise, sour cream, grated cheddar, shredded mozzarella, garlic powder, onion powder, and black pepper. Mix until smooth and well combined.

Step 4: Assemble the Casserole

Pour the cheese mixture evenly over the onion rings, ensuring all the onions are coated.

Step 5: Add the Topping

In a small bowl, mix the crumbled Ritz crackers with melted butter. Sprinkle the buttery cracker mixture evenly over the top of the casserole.

Step 6: Bake

Bake in the preheated oven for 30–35 minutes, until the onions are tender and the cheese is bubbly and golden brown.

Step 7: Garnish and Serve

Optional: Sprinkle chopped parsley on top for a fresh, colorful touch. Serve the casserole hot as a side dish alongside roasted meats, casseroles, or a hearty main course.

Recipe Details

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

Variations & Substitutions

• Cheese Swap: Use pepper jack or Gruyère for a different flavor profile.
• Gluten-Free: Replace Ritz crackers with gluten-free breadcrumbs or crushed nuts.
• Add Veggies: Mix in sliced bell peppers or mushrooms for extra texture and flavor.
• Extra Creamy: Stir in 2 tablespoons of cream cheese for an even richer sauce.

Serving Suggestions