Lightly spray your tart pan with non-stick cooking spray. Place your pastry dough into your prepared pan, poke holes in the dough with a fork and place the pan in the refrigerator for 15 minutes.
Preheat oven to 425°F. Remove your pan from the refrigerator and place a large piece of parchment paper on top of dough and fill with dry beans (or pie weights). Press beans into edges of dough and bake in the oven for 10 minutes. Remove from oven and allow the pastry to cool completely on a wire rack.
Reduce oven to 375°F.
In a mixing bowl, toss the apples with 1/3 cup sugar and the cinnamon. Put them in the partially baked pie shell and bake for 20 minutes. Remove from the oven and let cool while making the custard.
Beat the egg and remaining 1/3 cup sugar in a mixing bowl until the mixture is thick and pale yellow. Beat in the flour, then the whipping cream, brandy, and vanilla. Pour the mixture over the apples.
Return to the oven for 10-12 minutes or until it begins to puff. Remove from oven and sprinkle with the powdered sugar (lightly covering the top of the tart). Return to the oven for 20 minutes. Tart is done when the top is brown and a knife plunged into the custard comes out clean. Serve while warm.
Notes
This tart is best served warm and on the day it was baked. Although the flavor was lovely the day after, the texture had definitely declined.