Place a baking sheet in the oven and preheat to 400 degrees F. Line a 9-inch pie plate with 1 piece of dough; refrigerate until ready to assemble.
Make the cinnamon-roll crust: Lay the remaining piece of dough on a lightly floured surface and spread the butter evenly on top. Combine 1/4 cup granulated sugar and 1 teaspoon cinnamon in a small bowl; sprinkle evenly over the butter, then gently press with your fingers to help the mixture adhere. Roll the pie dough into a tight log. Trim and discard about 1 1/2 inches from both ends; cut the remaining log crosswise into 1/2-inch-thick pieces. Arrange the pieces cut-side down in a snug circle on floured parchment paper. Lightly dust with more flour, then gently roll out into a 10-inch round. Slide the parchment onto a baking sheet and refrigerate until ready to assemble the pie.
Peel and thinly slice the apples. Toss with the lemon juice, vanilla and the remaining 1/4 cup granulated sugar and 1/8 teaspoon cinnamon in a large bowl. Transfer to the dough-lined pie plate; invert the cinnamon-roll crust on top and peel off the parchment (it's OK if the individual rounds separate a bit in the process). Pinch the crusts together; fold the overhanging dough under itself and crimp as desired. Brush with the beaten egg.
Set the pie on the hot baking sheet in the oven; bake until the crust is golden brown and the filling is bubbling, about 50 minutes. (Tent loosely with foil if the top browns too quickly.) Transfer to a rack to cool slightly.
Whisk the confectioners' sugar and 2 tablespoons milk in a bowl until smooth. (Add more milk if the glaze is too thick.) Drizzle over the pie.
Photograph by Levi Brown
Courtesy of Food Network Magazine
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