Cheeseburger Chowder

Ingredients (8)

• + 2 pounds ground beef add to pantry
• + 2 (15 ounce) cans diced new potatoes add to pantry
• ✓ 1 cup chopped onion
• ✓ 4 cups milk
• + 1 pound processed cheese food (such as Velveeta ®), cut into chunks add to pantry
• + ½ pound sharp Cheddar cheese, cut into chunks add to pantry
• + ground black pepper to taste add to pantry
• + ⅔ cup mashed potatoes add to pantry