Lightly spoon flour into dry measuring cups, and level with a knife. Place flour and next 4 ingredients (flour through vanilla) in a food processor, and pulse 4 to 5 times or until oat mixture resembles coarse meal. Press half of oat mixture into the bottom of a 13 x 9-inch baking pan coated with cooking spray. Spread apricot preserves over oat mixture. Sprinkle remaining oat mixture over preserves, and gently press. Bake mixture at 350° for 35 minutes or until bubbly and golden brown. Cool bars completely in pan on a wire rack.