In a bowl, combine melted butter, flour, baking powder, sugar, salt, and milk. The dough will be shaggy. Bring it together with your hands.

Roll it out on a lightly floured surface into a rectangle.

In a small bowl, combine one tablespoon butter, brown sugar, and cinnamon. Spread over dough.

Cut dough into three strips with a knife or pizza cutter.

Roll up middle strip.

Match up cut edges and roll up the other two strips into one cinnamon roll.

Place in a greased mug.

Combine powdered sugar, milk and vanilla for glaze and set aside.

Cook the bun in a microwave for 90 seconds. If it seems undercooked, cook for 10 additional seconds.

Drizzle roll with glaze and enjoy warm.