Slice the peaches and place them in a bowl. Add the cornstarch, vanilla, and coconut sugar, then gently toss until the peaches are evenly coated.
In a separate bowl, combine the oats, almond flour, maple syrup, melted butter, coconut sugar, and a pinch of salt. Mix until a crumbly topping forms.
Transfer the peaches to an oven-safe ramekin or small baking dish, then evenly sprinkle the crumble mixture over the top.
Air fry at 325°F for 8-10 minutes, checking around the 8-minute mark to make sure the topping doesn't brown too quickly. The peaches should be tender and the crumble lightly golden.
Let the peach crisp cool for about 5 minutes before serving. Top with whipped cream and a sprinkle of cinnamon, if desired.