I found this recipe on HealthfulPursuit.com

If you love chocolate, you’re going to adore these gluten-free chocolate muffins. Rich, moist and chocolately, these muffins are a chocolate-lover’s dream.
Ingredients
 
Dry:
  • ½ cup + 3 tablespoons chickpea flour
  • ¼ cup + 3 tablespoons sugar
  • 3 tablespoons cocoa powder
  • 1 teaspoon baking powder
  • 1 teaspoon baking soda
  • pinch sea salt
Wet:
  • ¼ cup non-dairy milk
  • 2 tablespoons egg whites
  • 2 tablespoons grape seed oil
  • 1 teaspoon pure vanilla extract
  • ¼ cup boiling water
Instructions
  1. Preheat oven to 350F and line a 6-cup muffin tin with paper liners. Set aside.
  2. Add flour, sugar, cocoa powder, baking powder, baking soda and salt. Stir to mix thoroughly.
  3. Add wet ingredients; milk, egg white, oil and extract.
  4. Mix thoroughly, then add boiling water. Stir completely.
  5. Let sit for 1 minute, then pour into prepared paper liners.
  6. Bake in preheated oven for 23- 25 minutes, or until toothpick inserted comes out clean. I found that the toothpick held a bit of gumminess due to using chickpea flour but left to cool, they firmed up perfectly to the consistency of a real, gluten-packed muffin.