Make the streusel: Line a small baking sheet with parchment paper. Combine the streusel ingredients in a bowl, breaking up any large clumps, and spread onto your baking sheet. Set aside to dry (can be made a day ahead; store covered at room temperature).
Make the streusel: Line a small baking sheet with parchment paper. Combine the streusel ingredients in a bowl, breaking up any large clumps, and spread onto your baking sheet. Set aside to dry (can be made a day ahead; store covered at room temperature).
Preheat oven to 350 F. Grease and flour a 12-cup muffin tin or line with parchment paper cups. Unroll your pie crust and use a glass or cookie cutter to cut circles that are slightly larger — about 1/4 inch — than the base of your muffin cups (I used a 2 1/2-inch cutter).
Place the circles in the bottom of each muffin cup, pressing gently along the sides and bottoms. Spoon some apple filling into each crust and top with the streusel.
Bake cookies for 20 minutes, or until streusel is golden brown. Cool completely in tins on a wire rack. Serve immediately or store, covered, for up to 3 days.