Easy Tater Tot Casserole

Bahan-bahan (8 porsi)

• 1½ pounds ground beef
• 1 small onion, (peeled and finely chopped)
• salt and freshly ground black pepper
• 32 ounces frozen tater tots
• Two 10.75-ounce cans condensed cream of mushroom soup
• 1⅓ cups milk
• 2 cups shredded cheddar cheese