Grease four 5.5 ounce ramekins with non-stick cooking spray. Set aside.
Add the berries, sugar, cornstarch, lemon juice and vanilla to a large bowl and stir to combine. Set aside.
In a medium-sized bowl, whisk together the oats, almond flour, brown sugar, cinnamon and salt.
Add the almond butter, maple syrup and coconut oil to a small microwave-safe bowl. Microwave for 30-40 seconds and then stir together until melted together and runny.
Add the almond butter mixture to the oat mixture and stir together until well combined.
Divide the fruit mixture into the 4 ramekins, including the juices. Top each one with the oat topping.
Place the ramekins in the air fryer basket. Air fry at 300F for 15-17 minutes, or until the filling is bubbling and the tops are golden brown.
Let sit for 15-20 minutes to allow the berry filling to set up.
Notes
Gluten-free oats. Oats are naturally gluten-free, but they can get contaminated with wheat products. Just look for a certified gluten-free label on the package.
Size of ramekins. I used 5.5 ounce ramekins and they were filled to the top. If your ramekins are smaller, you could probably get 5 individual crisps from the recipe.
Size of air fryer. I have a 5.8 quart air fryer and 4 ramekins fit perfectly in my air fryer basket. If you have a smaller air fryer, you may need to air fry in 2 batches.
If using frozen berries: You'll want to add another ½ tablespoon of cornstarch to the berry mixture since frozen berries release more juices. You don't need to thaw the berries first.
Tart filling: In my testing, I found that using fresh berries in the filling resulted in a more tart flavor. If you're not a fan of tart, you can add another tablespoon of granulated sugar, or you can use frozen berries, which results in a less tart filling.