HEAT oven to 350 degrees F. Spray a 13 x 9-inch pan with no-stick cooking spray.
COMBINE oats, 1 1/2 cups flour, brown sugar, shortening, water, baking soda and salt in large bowl; stir with spoon until well blended. Reserve 1 cup. Press remaining into bottom of prepared pan.
BAKE 10 to 12 minutes or until light brown. Remove pan to cooling rack. Cool 10 minutes.
SPRINKLE with nuts and chocolate chips.
COMBINE caramel topping and remaining 1/4 cup flour. Stir until smooth. Drizzle over chocolate chips to within 14 inch of pan edges. Sprinkle with reserved oat mixture.
RETURN to oven. Bake 18 to 22 minutes or until golden brown. Loosen from sides of pan with knife. Remove pan to cooling rack to cool. Cool completely.
CUT into bars about 2 x 1 1/2 inches.