2 Coat a 9-inch springform pan with cooking spray. Combine crumbs, 2 tablespoons sugar, and margarine. Firmly press crumb mixture into bottom and 2 inches up sides of pan.
3 Combine 2/3 cup sugar, flour, and next 5 ingredients (flour through eggs) in a large bowl; beat at high speed of a mixer until smooth. Add milk and sour cream to cheese mixture; beat until smooth.
4 Beat egg whites (at room temperature) at high speed of a mixer until soft peaks form. Gradually add 1/4 cup sugar, 1 tablespoon at a time, beating until stiff peaks form using clean, dry beaters. Gently fold egg white mixture into cheese mixture.
5 Pour into prepared pan. Bake at 300 degrees for 55 minutes or until almost set. Remove from oven, and cool completely on a wire rack; cover and chill 8 hours. Top with pie filling.