Preheat the oven to 400 degrees F. Grease muffin tin well or line with paper liners.
In a medium bowl, whisk together the spelt flour, cocoa powder, salt, baking powder and baking soda.
1 ½ cups spelt flour, 5 tablespoon cocoa powder, ½ teaspoon salt, 1 ½ teaspoon baking powder, 1 teaspoon baking soda
In a blender combine melted and cooled coconut oil, coconut sugar, spinach, buttermilk, eggs and lemon zest and blend to create a "green smoothie".
⅓ cup coconut oil (melted), ¾ cup coconut sugar , 2 cups packed down spinach, 1 cup buttermilk, 3 eggs large, zest from one lemon
Add the green smoothie to the dry ingredients and mix until just combined. Stir in chocolate chips.
½ cup chocolate chips (plus some to top the muffins if desired)
Distribute batter into the prepared muffin wells. If desired, top muffins with a few chocolate chips. (If you want to be consistent with the muffin size I weighed 85 grams of batter into each muffin well)
Bake in a preheated oven at 400 degrees F for 5-6 minutes and then lower the oven temperature to 350 degrees F. (No need to open the oven door.)
Continue to bake for 13-15 minutes. Total baking time is approximately 20 minutes. The muffins are ready when a cake tester comes out clean.