1/4 cup confectioners’ sugar
1/4 teaspoon baking powder
Pinch of salt
5- 6 tablespoons all-purpose flour
1/4 cup cold (1/2 stick) unsalted butter, cut into pieces
1 1/2 pounds ripe (4 to 5 medium) yellow peaches, pitted and quartered
2 to 4 tablespoons granulated sugar
Pinch of salt
5 tablespoons crème fraîche
Make streusel: Stir confectioners’ sugar, baking powder, salt and three tablespoons flour together in a small bowl. Add bits of cold butter, and either using a fork, pastry blender or your fingertips, work them into the flour mixture until it resembles coarse crumbs. Add additional flour as needed.
Par-bake crust: Tightly press a piece of aluminum foil against frozen pie crust. At this point, you should fill your pie crust with pie weights (i.e. dried beans are perfect) or you can cross your fingers and hope that with some fork-pricking and the foil, your crust doesn't go haywire on you. At any rate, bake for 10 minutes, then remove carefully remove foil and any weights you have used, press any bubbled-up spots in with the back of a spoon, and return the crust to the oven for another 5 to 8 minutes, or until it is lightly golden brown. Transfer to a wire rack to cool slightly. Reduce oven temperature to 375°F.
Make the filling: Sprinkle quartered peaches with sugar (two tablespoons will make a just-barely-sweeteened pie; add the other two for a still not overly-sweet but sweeter pie) and salt. Let sit for 10 minutes. Spread two tablespoons crème fraîche in bottom of par-baked pie shell, sprinkle with one-third of the streusel and fan the peach quarters decoratively on top. Dot the remaining three tablespoons of crème fraîche on the peaches and sprinkle with remaining streusel.