Preheat the air fryer: Set to 375°F (190°C) and let it heat for 3 minutes.
A warm basket helps the bread crisp.
Make the custard: In a shallow bowl, whisk eggs, milk, vanilla, cinnamon, salt, and sugar or maple if using. Whisk until smooth.
Prep the bread: If your bread is very soft, let slices air out for 10 minutes. Slightly stale bread absorbs custard without getting soggy.
Dip the slices: Submerge each slice for 5–8 seconds per side.
Let excess drip back into the bowl. You’re aiming for damp, not saturated.
Grease the basket: Lightly spray or brush with butter. Arrange slices in a single layer with space around each piece.
Air fry, round one: Cook at 375°F (190°C) for 4 minutes.
Don’t open the basket early—heat is key for crisp edges.
Flip and finish: Carefully flip, brush with a tiny bit of melted butter if desired, and cook 3–4 more minutes. They’re done when golden and slightly puffed.
Warm batch, happy batch: If cooking in batches, keep finished slices on a rack in a 200°F (95°C) oven so they stay crisp.
Serve: Top with maple syrup and berries, dust with powdered sugar, or go savory with a drizzle of hot honey and a side of bacon.