Drain ground beef thoroughly to prevent a watery filling. The beef should reach an internal temperature of 160°F before assembling. Do not overmix the biscuit dough or the topping will become dense. Bake uncovered so the biscuits rise properly and turn golden. Let the casserole rest 5–10 minutes before serving. Store leftovers in an airtight container up to 4 days or freeze up to 3 months.