Preheat oven to 375°F (190°C) and grease a 12-cup muffin tin.
In a bowl, whisk together flour, sugar, and salt for the crust. Cut in cold butter until mixture resembles coarse crumbs, then stir in ice water until a shaggy dough forms.
Press about 2 tablespoons of dough into each muffin cup and chill the tin for 10 minutes.
Toss cherries with sugar, cornstarch, lemon juice, and salt, then divide the filling evenly among the chilled crusts.
Combine flour, sugars, cinnamon, and butter for the crumb topping, cutting until large crumbs form. Sprinkle topping over each mini pie.
Bake 22–25 minutes or until crumbs are golden brown and the filling is bubbling.
Allow minis to cool in the pan for 5 minutes before transferring to a wire rack to cool completely.
Notes
Store cooled Cherry Crumb Pie Minis in an airtight container at room temperature for up to 2 days, or refrigerate for up to 5 days.For longer storage, freeze minis in a single layer on a baking sheet, then transfer to a resealable bag for up to 2 months. Reheat at 325°F (160°C) for 8–10 minutes, tenting with foil if the topping browns too quickly.