Preheat your oven to 375° and line a 12-count muffin tin.
In a medium mixing bowl, mix together the flour, protein powder, baking powder, baking soda, and cinnamon. Set aside.
In a separate bowl, whisk together the coconut sugar, plain Greek yogurt, oil, eggs, and vanilla. Whisk until no clumps remain.
Add the dry ingredients and stir until almost combined. Add the chocolate chips and stir until just combined.
Divide the batter evenly between 12 muffins, then bake for 14-16 minutes or until a toothpick inserted in the center comes out clean. Allow to cool, then serve!