Preheat the oven to 400°F and line a 12-cup standard muffin pan with paper liners or spray with gluten-free nonstick cooking spray.
In a large bowl, whisk together the flour, cocoa powder, xanthan gum, sugar, baking powder, baking soda, and salt. Stir in the chocolate chips and then set the bowl aside.
In a medium bowl, whisk together the eggs, buttermilk, coffee, oil, and vanilla extract. Pour the wet ingredients into the dry ingredients and stir until combined.
Transfer the batter to the prepared muffin cups, dividing the batter evenly. Bake for 15-18 minutes or until done. Let cool in the pan for 5 minutes before transferring the muffins to a wire rack to finish cooling.
Notes
Notes:
• To make this recipe dairy-free, use dairy-free chocolate chips and, in place of the buttermilk, mix ½ cup unsweetened coconut milk beverage (or dairy-free milk of choice) with 1½ teaspoons white vinegar; let sit for 5 minutes before using. Dairy-free plain or vanilla yogurt can also be used.
• Store leftovers at room temperature in an airtight container for up to 3 days. These muffins also freeze well in a freezer bag. Defrost at room temperature or in the microwave.