Cover the raisins with hot water or apple juice in a bowl and allow them to soak for at least 30 minutes, or overnight. (Or you can microwave the raisins and water in a microwave safe bowl for 1 minute then let them sit for 10 minutes.)
Peel and thinly slice the apples. Discard the cores. (You want the apple slices as thin and as evenly sliced as possible, so use a sharp kitchen knife or a mandoline slicer.) In a large bowl, mix the soaked and drained raisins, apple slices, chopped nuts, lemon juice, granulated sugar, cinnamon, and nutmeg. Set aside.
Preheat the oven to 400°F. Line a baking sheet with parchment paper.
Separate one sheet of thawed phyllo dough and place it on your counter. Use a pastry brush to brush a little melted butter on the dough.
Fold the sheet of phyllo dough in half widthwise (hold a shorter edge and bring it to meet the other short edge). Brush a little more butter on the top of the phyllo dough.
Spread about 2 teaspoons of the bread crumbs evenly over the folded dough. Scoop out a few large spoonful's of the apple filling in a line down the center of the dough width-wise.
Fold the edges and sides of the phyllo dough over the apple filling. Place it seam-side-down on the prepared baking sheet. Repeat with the remaining sheets of phyllo dough and apple filling. (You should have 6 mini apple strudels in total.)
Brush the top of your mini apple strudels with the remaining melted butter.
Bake for 12 to 15 minutes, until the strudels are golden and crispy. Allow your strudels to cool for 10 minutes, then dust the top with sifted powdered sugar and serve.