You can store these chai muffins in an airtight container at room temperature for up to 5 days. You can also freeze these muffins for up to 2 months. Before serving, bring out the muffins from the freezer and let them thaw at room temperature for 5-8 hours or warm them in a microwave for 2-3 minutes. You can also prepare the batter one day ahead and refrigerate overnight before baking.