1Heat oven to 375°F. In large bowl, stir together all ingredients except preserves and additional powdered sugar with spoon until crumbly. Reserve 2 cups of the mixture for topping; press remaining mixture in bottom of ungreased 15x10x1-inch pan.
2Bake 15 to 20 minutes or until crust is golden brown. Spread with preserves. Sprinkle with reserved crumb mixture; press gently into preserves.
3Bake 20 to 25 minutes longer or until light golden brown. Cool completely, about 1 hour. Sprinkle with additional powdered sugar. For bars, cut into 12 rows by 6 rows.