Ensure eggs and milk are at room temperature for even mixing. Do not overmix the batter to avoid dense texture. Check that your gluten free flour blend contains xanthan gum or add 1 teaspoon if needed. Remove muffins as soon as a toothpick comes out clean to prevent drying. Store in an airtight container for 2–3 days or freeze individually wrapped for up to 2 months. For banana variation, reduce sugar to 1/2 cup, add 1 cup mashed bananas, and reduce milk to 3/4 cup.