1 Pulse Together Flour, Sugar, Baking Powder, And Salt In A Food Processor Until Combined. Add Butter And Pulse Just Until Mixture Resembles Coarse Meal With Some Small (Roughly Pea-Size) Butter Lumps. Add Egg And Vanilla And Pulse Just Until Dough Clumps And Begins To Form A Ball, About 15 Pulses. 2 Butter And Dust With Flour The Inside Of Your Springform Pan. Press Dough Onto Bottom And Evenly (About 1/4 Inch Thick) About Two Inches Up Side Of Springform Pan With Floured Fingertips. Chill Pastry In Pan Until Firm, About 10 Minutes. 3 Put Oven Rack In Middle Position And Preheat Oven To 375