In a shallow dish, whisk together 2 eggs, 1/2 cup milk, 1 teaspoon cinnamon, 1 teaspoon vanilla extract, 1 tablespoon sugar, and a pinch of salt.
Cut 4 slices of bread into 3 equal sticks.
Dip each bread stick into the egg mixture, making sure to coat both sides evenly without soaking for too long.
Preheat the air fryer to 375°F (190°C) for 3 minutes.
Brush the air fryer basket with 1 tablespoon melted butter and place the bread sticks in a single layer.
Cook the French toast sticks for 8-10 minutes, flipping halfway through, until golden brown and crispy.
Remove from the air fryer and serve immediately with your choice of toppings.