Preheat the oven to 350°F (175°C) and line a 12-cup muffin pan with cupcake liners.
Add the rolled oats, coconut oil, applesauce, cocoa powder, coconut palm sugar, vanilla extract, Greek yogurt, cream of tartar, baking powder, baking soda, salt, and hot water to a high-powered blender or food processor.
Blend until the oats are ground and the batter is smooth and well combined.
Stir the chocolate chips into the batter by hand.
Divide the batter evenly among the 12 liners and sprinkle the tops with coconut flakes.
Bake for 15–18 minutes, or until a toothpick inserted into the center comes out clean.
Remove from the oven and cool completely before serving.