Cheesy Baked Onion Casserole — Rich, Creamy, and Comforting

Cheesy Baked Onion Casserole — Rich, Creamy, and Comforting

Introduction

This Cheesy Baked Onion Casserole is a crowd-pleasing side dish that will steal the show at any party or family gathering. Sweet, tender onions are layered with a luscious blend of cheeses, mayonnaise, and sour cream, then topped with buttery, crispy Ritz crackers for a golden finish. It’s creamy, savory, and utterly comforting—perfect for holiday dinners, potlucks, or anytime you want a dish that’s guaranteed to disappear fast!

Ingredients

For the onions and base

• 2–3 large sweet onions, sliced into ¼-inch rings (about 500 g / 1 lb)
• Cooking spray or butter, for greasing a 9×13-inch (23×33 cm) baking dish

For the cheesy sauce

• 1 cup mayonnaise (240 ml)
• ½ cup sour cream (120 ml)
• 1 ½ cups grated cheddar cheese (150 g / 5 oz)
• ½ cup shredded mozzarella cheese (50 g / 1.75 oz)
• ½ teaspoon garlic powder (1 g)
• ½ teaspoon onion powder (1 g)
• ¼ teaspoon black pepper (0.5 g)

For the topping

• ½ cup crushed Ritz crackers (55 g / 2 oz)
• 2 tablespoons unsalted butter, melted (28 g)
• Optional garnish: chopped parsley (5 g / 2 tablespoons)

Directions