Preheat to 350°F (175°C) and line a muffin tin with liners.
In a bowl, whisk together flour, baking powder, baking soda, and salt.
Add maple syrup, milk, egg, and vanilla and stir until smooth
Mix cinnamon, sugar, and melted coconut oil in a small bowl
Fill muffin cups halfway with batter
Add a small spoonful of the cinnamon swirl, then top with more batter, and additional cinnamon swirl
Use a toothpick to swirl gently
Bake for 15-18 minutes until a toothpick comes out clean
Cool and serve