1Heat oven to 400ºF. Mix flour, 2 tablepoons sugar, the salt and baking powder in medium bowl. Cut in butter, using pastry blender or crisscrossing 2 knives, until mixture looks like fine crumbs. Pat mixture firmly and evenly in bottom and halfway up sides of ungreased square pan, 8x8x2 inches.
2Spread peaches in crust in pan. Mix 1/3 cup sugar and the cinnamon; sprinkle over peaches. Bake 15 minutes.
3Beat egg yolks and whipping cream until well blended; pour over peaches. Bake 25 to 30 minutes or until custard is set and edges are light brown. Serve warm. Store covered in refrigerator.