Cheesy Chicken and Broccoli Casserole
Ingredients:
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1 teaspoon unsalted butter, or as needed
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2 each skinless, boneless chicken breasts, cubed
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3 cups finely chopped broccoli
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2 (10.5 ounce) cans condensed cream of chicken soup
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1 cup shredded Cheddar cheese
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1 cup shredded Parmesan cheese, divided
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½ cup shredded mozzarella cheese
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½ cup sour cream
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1 pinch ground black pepper to taste