Method
Preparation
In a mixing bowl, combine the flour and powdered sugar.
Add cold, cubed unsalted butter and mix until coarse crumbs form.
Stir in egg yolk and cold water until dough comes together.
Shape into a disk, wrap in plastic, and refrigerate for at least 30 minutes.
Beat together softened butter and granulated sugar until light and fluffy.
Mix in almond flour, egg, almond extract, and all-purpose flour until smooth.
Preheat oven to 375°F (190°C).
Roll out chilled dough and cut into circles for tartlet pan.
Press dough circles into the tartlet pan and trim excess.
Fill tartlet shells with almond frangipane until 2/3 full.
Top with sliced peaches and sprinkle with sliced almonds.
Bake for 25-30 minutes until golden and set.
Cool tartlets slightly in pan, then transfer to wire rack.
Dust with powdered sugar before serving if desired.
Serve warm or at room temperature.
Notes
Ensure butter is cold for a flaky crust. Avoid overmixing the dough. Keep an eye on tartlets while baking to prevent over-browning.