Cut the angel food cake into roughly 1-inch cubes. No need to be precise—this isn’t a geometry test.
In a bowl, mix the sugar and cinnamon. Set it aside for the magic moment.
If using an air fryer, spray the cake cubes lightly with oil and air fry at 375°F for 4-5 minutes until golden and crisp. If using a skillet, heat a light layer of oil over medium heat and toast the cubes, turning them until all sides are golden.
While still warm, toss the cubes in the cinnamon sugar mixture until coated like little churro treasures.
Serve immediately, maybe with a side of chocolate or caramel sauce if you’re feeling extra.