Preheat oven to 350 degrees F and lightly grease a 24-cup mini muffin pan (a silicone muffin pan is recommended).
In a large mixing bowl, whisk together the ground flaxseed, coconut sugar, cacao, tapioca starch, baking powder, and salt.
1 cup ground flaxseeds, 1 cup coconut sugar, ⅓ cup cacao powder, ¼ cup tapioca starch, 2 teaspoons baking powder, ¼ teaspoon fine sea salt
Make a well in the center of the dry ingredients. Add the eggs, melted coconut oil, milk, and vanilla. Whisk the wet ingredients together in the center and then mix everything together until fully combined.
2 eggs, room temperature, ¼ cup coconut oil, melted, ⅓ cup milk of choice, 1 teaspoon pure vanilla extract
Scoop batter into prepared muffin cups, filling each muffin cup to the top.
Bake for 14-15 minutes, or until a toothpick inserted in the center comes out clean. Allow to cool slightly before removing from the pan. Transfer to a cooling rack to cool completely.