Preheat oven to 350 degrees F. Grease a 9-inch tart pan with butter.

In a large bowl, whisk together the flour, powdered sugar, and salt. Cut the butter into the mixture with a pastry cutter until the mixture resembles coarse crumbs.

Add the egg and vanilla extract and stir until the dough comes together. Wrap the dough in plastic wrap and refrigerate for at least 30 minutes.

On a lightly floured surface, roll out the dough into a 12-inch circle. Place the dough into the prepared tart pan and trim the edges.

In a medium bowl, toss together the apples, sugar, cinnamon, and nutmeg. Arrange the apples in a circular pattern on top of the dough.

In a small bowl, combine the apricot preserves and water. Brush the mixture over the apples.

Bake for 40-45 minutes, or until the crust is golden-brown and the apples are tender. Let cool before serving.

Enjoy!