Prepare pancake batter according to direction.
In a large microwave safe bowl, combine the butter, brown sugar and cinnamon until smooth.
Microwave on high for 10 second increments until it is soft and can be squeezed through a pastry bag.
Transfer mixture into a pastry bag fitted with a medium tip. Or, you can use a Ziploc bag with the corner snipped off.
Pour pancake batter onto hot griddle.
Pipe cinnamon mixture onto batter in a swirl shape.
When pancakes are lightly browned, flip and cook until done.