Apple Shortbread Tart

Ingredients

• Crust
• 1 1/4 cups unbleached white flour
• 1 tablespoon sugar
• 1 teaspoon baking powder
• 1/2 cup butter, at room temperature,cut into eight pieces
• 1 egg yolk
• 1 tablespoon heavy cream
• Filling
• 7 medium tart apples, peeled,cored,and sliced thinly
• 1/2 cup sugar (or to taste)
• 2 tablespoons butter, softened
• 1 1/2 tablespoons unbleached white flour
• 1/2 teaspoon ground cinnamon