If batter is too thick, add a tablespoon of milk and stir gently. Use room temperature eggs and milk for better mixing and rise. Avoid overmixing to prevent dense muffins. Cool on wire rack to keep crust crisp. For extra crispness, use convection oven if available. Muffins can be baked in an air fryer at 375°F (190°C) for 12-15 minutes. Store leftovers in an airtight container in the refrigerator up to 3 days; reheat in oven or toaster oven to maintain crispness.