01 -
Preheat your oven to 375°F (190°C). Lightly grease a 9x13 inch baking dish. In a small bowl, combine 1 cup panko breadcrumbs, 1/4 cup grated Parmesan cheese, and 2 tbsp unsalted butter, melted; set this golden crumb topping aside.
02 -
In a large skillet or Dutch oven over medium heat, melt 1/4 cup unsalted butter. Add 1/2 yellow onion, diced, and cook for 3-4 minutes until softened. Stir in 2 cloves garlic, minced, and 4 cups fresh broccoli florets, chopped. Cook for 3-5 minutes until the broccoli is vibrant green.
03 -
Sprinkle 1/4 cup all-purpose flour over the vegetables, stirring for 1 minute. Gradually whisk in 2 cups 2% milk and 1 cup low-sodium chicken broth until smooth. Bring to a simmer, then reduce heat. Stir in 2 cups shredded sharp cheddar cheese, 1/2 cup plain Greek yogurt, and 1 tsp Dijon mustard until melted and creamy. Season with 1/2 tsp dried thyme, 1/2 tsp smoked paprika, salt, and freshly ground black pepper to taste. This rich sauce is key for your High-Protein Chicken Broccoli Rice Casserole.
04 -
Remove the skillet from heat. Fold in 2 lbs boneless, skinless chicken breast, cooked and shredded or diced, and 2 cups cooked brown rice into the creamy cheese sauce and vegetable mixture. Ensure all ingredients are well combined. This forms the hearty base of your High-Protein Chicken Broccoli Rice Casserole.
05 -
Transfer the entire High-Protein Chicken Broccoli Rice Casserole mixture into the prepared 9x13 inch baking dish, spreading it evenly. Sprinkle the reserved panko breadcrumb and Parmesan cheese topping generously over the casserole.
06 -
Bake for 30-35 minutes, or until the casserole is bubbly around the edges and the topping is golden brown and crisp. The internal temperature should be hot throughout.
07 -
Remove the High-Protein Chicken Broccoli Rice Casserole from the oven and let it rest for 5-10 minutes before serving. This allows the casserole to set, making it easier to portion and enjoy this delicious meal.