Unwrap caramels and place in medium size bowl. Add 1/4 C. water and 1/2 C. peanut butter. Microwave 3-5 minutes on high, stirring once. Add 4 C. Cheerios, 1 C. peanuts, and stir to mix. Spread into 9x13 inch pan. Let cool. In small bowl mix 1 C. chocolate chips, 1/4 C. peanut butter, and 1 Tbs. shortening and microwave 2-4 minutes on high. Spread on top of bars.