Make sure your butter and cream cheese are softened to room temperature for the smoothest frosting. Don’t overmix the dough once you add the flour; overmixing can make the cookies tough. Chilling the dough is key for preventing the cookies from spreading too much and helps develop flavor. Variations include adding nuts, chocolate chips, or increasing the spice level. Store frosted cookies in the refrigerator up to 5 days, or unfrosted at room temperature up to 3 days or frozen for up to 3 months.