Cheesy Chicken and Broccoli Casserole

Ingredients (9)

• + 1 teaspoon unsalted butter, or as needed add to pantry
• ✓ 2 each skinless, boneless chicken breasts, cubed
• + 3 cups finely chopped broccoli add to pantry
• + 2 (10.5 ounce) cans condensed cream of chicken soup add to pantry
• + 1 cup shredded Cheddar cheese add to pantry
• + 1 cup shredded Parmesan cheese, divided add to pantry
• + ½ cup shredded mozzarella cheese add to pantry
• + ½ cup sour cream add to pantry
• + 1 pinch ground black pepper to taste add to pantry