Cut the brioche slices into 9 equal squares.

In a shallow bowl, whisk the eggs until lightly beaten. Add the milk, vanilla, ¼ teaspoon of the cinnamon, and a pinch of salt; whisk until combined.

Preheat the oven to 350°F and generously spray the basket with cooking oil.

Dip each bread square into the egg mixture for about 5 seconds per side. Only dip as many pieces as will fit in your air fryer basket without crowding.

Arrange the coated bread pieces in a single layer in the air fryer. Air fry for 5–8 minutes, or until golden and crisp.

While the bites cook, stir together the remaining cinnamon and the granulated sugar in a small bowl.

Immediately toss the hot French toast bites in the cinnamon-sugar mixture so it sticks well.

Repeat with remaining bread squares as needed.

Serve with fresh fruit, powdered sugar, or maple syrup and enjoy!