Peel your sweet potatoes.

Cut them into thick 1-inch slices.

Place your sweet potato rounds in boiling water and boil them until they are fork tender. About 10 minutes.

Preheat your air fryer to 400 degrees. 

Strain the sweet potatoes. Put them on a parchment paper-lined air fryer basket or tray.

Smash them using a bottom of a glass.

Melt the butter in the microwave for 30 seconds until completely melted. 

In the butter, add the brown sugar and cinnamon. Mix well. 

Using a spoon, spoon the butter mixture onto the sweet potatoes.

Air fry at 400 degrees for 10 minutes or until crispy and golden brown. 

Serve and enjoy!