Creating Mini Apple Crumb Tarts is a straightforward process if you follow these steps:

1. Prepare the Crust:
– In a mixing bowl, combine the flour, sugar, and salt.
– Cut the cold butter into the flour mixture until it resembles coarse crumbs.
– Gradually add iced water, one tablespoon at a time, until the dough forms.
– Shape the dough into a disc, wrap it in plastic, and refrigerate for at least 30 minutes.

2. Prepare the Filling:
– In another bowl, mix sliced apples, lemon juice, cinnamon, and brown sugar.
– Let it sit for about 10 minutes to allow the flavors to meld.

3. Preheat the Oven:
– Preheat your oven to 375°F (190°C).

4. Roll Out the Dough:
– Once chilled, roll out the dough on a floured surface until about 1/8-inch thick.
– Cut out circles to fit your tart pans (about 3 inches in diameter).

5. Assemble the Tarts:
– Carefully press the dough circles into the tart pans.
– Fill each tart shell with the apple mixture, distributing evenly.

6. Make the Crumb Topping:
– In a separate bowl, combine oats, flour, melted butter, and sugar, mixing until crumbly.
– Generously sprinkle the crumb mixture over the apples in each tart shell.

7. Bake:
– Place the filled tart pans in the preheated oven and bake for 20-25 minutes, or until the topping is golden brown and the apples are tender.

8. Cool and Serve:
– Remove the tarts from the oven and let them cool in the pans for 15 minutes.
– Carefully remove the tarts from the pans and allow them to cool completely on a wire rack.