When jars are removed from air fryer, use the back of a spoon to gently press down on the blueberry filling.
Set aside.
To make Crumble Topping:
Combine all ingredients in a medium bowl.
Distribute mixture over cooked filling in jars.
Place three jars back in air fryer and cook for an additional 5 minutes.
Repeat cooking with remaining jars.
Let jars cool for 10 minutes before eating or covering.
Refrigerate until ready to serve, up to four days.
Notes / Tips / Wine Advice:
Using Jam Jars
Jam jars are traditionally used for canning but serve other purposes as well. By making desserts in these jars, it not only pre-portions your recipes, but it also makes them portable for easy grab-and-go lunch additions.