Mini blueberry skillet crumbles baked in cast iron skillets! Topped with golden crumble, you’ll love this easy summer dessert! Serve warm with vanilla ice cream.
Make crumble topping: Whisk together oats, flour, brown sugar, cinnamon, and salt in a medium bowl. Cut in butter with a pastry blender or fork until large crumbs form. Keep chilled while preparing filling.
Make filling: Whisk together sugar, arrowroot starch, and salt in a medium bowl. Add blueberries, lemon thyme, and lemon juice; toss to combine. Divide filling evenly among skillets (about 1/2 cup per skillet) and sprinkle with chilled topping, pressing gently to adhere.
Chill assembled crumbles for at least 1 hour in the refrigerator, or up to 1 day. Preheat oven to 375°F.
Bake crumbles for 35 minutes, until filling is bubbling and topping is golden brown. Let cool on a wire rack for 20 minutes before serving with ice cream.