Pioneer Woman Broccoli Rice Casserole

Ingredients

• 1 tsp freshly ground black pepper
• 4 tbsp all-purpose flour
• 3 cups grated sharp Cheddar
• 1 garlic clove, grated
• 4 tbsp salted butter
• 1/4 tsp cayenne
• 1 medium yellow onion, finely diced
• 1/2 tsp kosher salt
• 4 ounces cream cheese, at room temperature
• 3 cups whole milk
• 8 ounces processed cheese, cubed
• 6 ounces diced pimentos, drained
• 2 1/2 cups cooked long-grain rice
• 8 cups small broccoli florets
• 1/2 cup grated Parmesan
• 1/2 tsp paprika
• 1/2 tsp dry mustard