In a medium-size mixing bowl, MIX sugar, cracker crumbs, peanut butter and butter until blended.
SCRAPE into ungreased 13 x 9-inch baking pan; PRESS into an even layer.
SPREAD melted chocolate chips over top.
REFRIGERATE at least two hours until chocolate is firm; LET STAND at room temperature 15 to 20 minutes before cutting with sharp knife into bars.
Per Serving (excluding unknown items): 478 Calories; 25g Fat (43.8% calories from fat); 9g Protein; 63g Carbohydrate; 4g Dietary Fiber; 0mg Cholesterol; 226mg Sodium. Exchanges: 1 Grain(Starch); 1 Lean Meat; 4 1/2 Fat; 3 Other Carbohydrates.