Easy Mashed Potato Casserole

Ingredients (10)

• ✓ 2 tablespoons butter
• + 9 large potatoes, peeled add to pantry
• + 1 (8 ounce) container sour cream add to pantry
• + 1 (6 ounce) package cream cheese add to pantry
• + 1 teaspoon onion salt add to pantry
• ✓ ½ teaspoon garlic powder
• + 1 dash ground black pepper add to pantry
• ✓ ½ cup shredded Cheddar cheese
• + 1 pinch dried parsley flakes, or to taste add to pantry
• + 1 pinch paprika, or to taste add to pantry