01 - Preheat oven to 350°F. Lightly grease a 9-inch tart pan with removable bottom.
02 - In a large mixing bowl, combine almond flour, all-purpose flour, granulated sugar, and salt. Cut in cold, cubed butter using a pastry cutter or fork until the mixture resembles coarse crumbs.
03 - Stir in egg yolk and ice water just until dough forms. Press dough evenly into the base and sides of the prepared tart pan. Prick the bottom with a fork and refrigerate for 15 minutes.
04 - Bake crust for 18 to 20 minutes, until lightly golden. Remove from oven and cool slightly.
05 - In a separate bowl, gently toss sliced peaches with granulated sugar, cornstarch, vanilla extract, and optional ground cinnamon.
06 - Arrange peach slices attractively over the cooled crust, overlapping slices. Pour any remaining juices from the bowl over the fruit.
07 - Bake for 20 to 25 minutes, until peaches are tender and the filling bubbles.
08 - While tart bakes, gently heat peach jam with water in a small saucepan over low heat, stirring until smooth.
09 - Remove tart from the oven and brush peaches with warm glaze for shine. Allow tart to cool completely before slicing.