In a small bowl, combine the flour, baking powder, salt, and 4 tablespoons of milk. Stir until a dough ball forms. If the dough is sticky, add a touch more flour. If it appears dry, add a splash more milk.

Lightly flour your countertop and roll the dough into a square roughly the same height as your mug.

Gently spread coconut oil over one side of the dough, then evenly sprinkle cane sugar and cinnamon across the surface.

Carefully roll the dough into a log.

Coat the inside of your mug with the remaining coconut oil.

Place the rolled dough inside the mug.

Microwave the mug for 50 seconds. If the dough still seems too moist, continue microwaving in 5-second intervals until it's no longer wet.

In a separate bowl, whisk together the frosting ingredients: powdered sugar and milk. Drizzle this over the cinnamon bun in the mug

Allow it to rest for 30 seconds.

Enjoy your cinnamon bun straight from the mug or transfer it to a plate. Best served warm.