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Million Dollar Chicken Casserole

This incredibly easy and comforting Million Dollar Chicken Casserole features tender chicken breasts topped with a rich, creamy, cheesy, and crunchy mixture, baked to golden perfection. It's a crowd-pleasing dish perfect for busy weeknights.
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Prep Time 10 minutes
Cook Time 45 minutes
Total Time 55 minutes
Servings: 4 servings
Course: Casserole, Dinner, Main Course
Cuisine: American
Ingredients Equipment Method Notes

Ingredients
  

  • 4 boneless, skinless chicken breasts
  • 1 cup mayonnaise
  • 1 cup shredded cheddar cheese
  • 1 cup shredded mozzarella cheese
  • 1/2 cup crispy fried onions
  • 1/2 cup breadcrumbs Panko works wonderfully
  • 1 tsp garlic powder
  • 1 tsp onion powder
  • 1/2 tsp salt
  • 1/4 tsp black pepper

Equipment

  • Baking dish
  • Cooking Spray
  • Mixing Bowl
  • Spoon or spatula
  • Aluminum foil

Method
 

  1. Step 1: Prep Your Oven and Dish. Preheat your oven to 375°F (190°C). Spray your baking dish with cooking spray.
  2. Step 2: Place the Chicken. Arrange the boneless, skinless chicken breasts in a single layer in your prepared baking dish.
  3. Step 3: Season Like a Pro. Sprinkle the garlic powder, onion powder, salt, and black pepper evenly over each chicken breast.
  4. Step 4: Craft the "Million Dollar" Topping. In a separate mixing bowl, combine mayonnaise, shredded cheddar cheese, shredded mozzarella cheese, crispy fried onions, and breadcrumbs. Mix everything together really well until thoroughly combined.
  5. Step 5: Top it Off! Carefully spoon and spread the topping mixture evenly over each seasoned chicken breast, ensuring every piece is generously covered.
  6. Step 6: Bake Covered. Cover your baking dish snugly with aluminum foil. Bake in the preheated oven for 30 minutes. This ensures the chicken cooks through gently and stays tender.
  7. Step 7: Golden Perfection. After 30 minutes, carefully remove the foil. Continue to bake for an additional 10-15 minutes, or until the chicken is completely cooked through (reaches 165°F / 74°C) and the topping is golden brown and bubbly.
  8. Step 8: Rest and Serve. Let the casserole rest for a few minutes before serving. This allows the juices to redistribute and the topping to set. Serve hot, optionally with a green salad or cheesy garlic breadsticks.

Notes

Substitutions & Additions: Use boneless, skinless chicken thighs for a juicier result. For cooked chicken, mix shredded rotisserie chicken into the topping and reduce covered baking time to 15-20 minutes. Swap cheeses with Monterey Jack, Colby Jack, or smoked gouda. Add steamed broccoli florets, spinach, chopped bell peppers, or thinly sliced mushrooms under the chicken. Spice it up with a pinch of red pepper flakes or smoked paprika. Add fresh chopped chives, parsley, dried Italian seasoning, or a tablespoon of dry ranch seasoning mix to the topping.
Tips for Success: Pound thick chicken breasts to an even thickness (3/4 to 1 inch) for even cooking. Don't overmix the topping; just combine. Ensure a generous, even layer of topping. Check chicken doneness with an instant-read meat thermometer (165°F / 74°C). Don't skip the resting step. Prep chicken and topping ahead and store separately in the fridge, then assemble and bake.
Storing & Reheating: Cool completely, then cover tightly and refrigerate for up to 3-4 days. For freezing, cool completely, then portion into freezer-safe containers for up to 2-3 months. Reheat refrigerated portions in the microwave or oven (350°F / 175°C, covered, 20-30 minutes). Thaw frozen portions overnight before reheating, or reheat from frozen at 325°F / 160°C, covered, for 45-60+ minutes.