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 15 x 10 x 1-inch pan. Bake 15 to 20 minutes or until crust is golden brown.
Spread with preserves. Sprinkle with reserved crumb mixture; press gently into preserves. Bake 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.
Yield: 72 bars
High Altitude (3500-6500 ft) Increase bake time for second baking to 25 to 30 minutes