01 - Preheat oven to 350°F. Line a 12-cup muffin tin with paper liners or grease lightly.
02 - Whisk together sweet rice flour, almond flour, baking powder, baking soda, and salt in a large bowl.
03 - Dissolve instant coffee granules in cooled French roast coffee in a small bowl.
04 - Whisk sugar, eggs, milk, oil, melted butter, vanilla extract, and coffee mixture until smooth in a medium bowl.
05 - Add wet ingredients to dry ingredients. Mix gently until just combined. Fold in chocolate chips or nuts if desired.
06 - Divide batter evenly among muffin cups, filling each about 3/4 full.
07 - Bake for 20-22 minutes until tops are set and a toothpick inserted in center comes out clean.
08 - Cool in pan for 5 minutes, then transfer to wire rack to cool completely.