Preheat oven to 375°F (190°C). Line a baking sheet with parchment paper or a silicone liner.
Unfold the thawed puff pastry on a lightly floured surface. If you like, gently roll to smooth out the fold marks.
Spread the apple butter over the pastry, leaving a small border around the edges.
Sprinkle the pecans and toffee bits over the apple butter.
Starting from a short end, tightly roll up the pastry. Use a sharp knife to trim the ends and then cut into 12 slices.
Place the sliced pastries cut-side down on the prepared pan.
Bake 18 to 20 minutes, or until golden brown. Cool the pastries on the pan on a wire rack for about 10 minutes. Then transfer to a wire rack to continue cooling.
To make the glaze:
Combine the confectioners' sugar and 2 teaspoons of the milk until thoroughly combined. Add more milk, a small amount at a time, until the glaze is thick but pourable.
Drizzle the glaze over the pastries. If you like, sprinkle more chopped pecans on top of the pastries.
Notes
These pastries are best the day they're made, but can be stored for a day or two in an airtight container.