Cheesy Broccoli-And-Rice Casserole | 94.7 QDR

Ingredients

• 6 Tbsp. unsalted butter, divided
• 1 cup panko (Japanese breadcrumbs)
• 2 cups (8 oz.) shredded extra-sharp Cheddar cheese, divided
• 3 cups reduced-sodium, fat-free chicken broth
• 2 cups whole milk
• 1 bay leaf
• 1 fresh thyme sprig
• 2 cups chopped onion
• 1/2 cup diced celery
• 1 (8-oz.) package sliced cremini mushrooms
• 1 tsp. kosher salt, divided
• Pinch of freshly ground black pepper
• Pinch of ground red pepper
• 2 garlic cloves, minced
• 1/4 cup all-purpose flour
• 1 1/2 cups uncooked long-grain rice
• 1/2 cup sour cream
• 1/2 cup mayonnaise
• 1/8 tsp. freshly grated nutmeg
• 3 cups fresh broccoli florets (about 2 heads)