In a large mixing bowl, MIX graham cracker crumbs, melted butter and powdered sugar.
PRESS mixture into an 8-inch square baking pan.
MIX coconut and sweetened condensed milk; SPREAD evenly over crumbs.
BAKE at 350F for 15-20 minutes.
MELT chocolate chips in microwave or in double boiler over hot water; SPREAD over cooled bars.
Be certain to use sweetened condensed milk and not evaporated milk. Milk chocolate chips may be substituted for all or part of the semisweet chocolate chips called for in the topping.
Per Serving (excluding unknown items): 815 Calories; 42g Fat (43.6% calories from fat); 10g Protein; 111g Carbohydrate; 5g Dietary Fiber; 59mg Cholesterol; 525mg Sodium. Exchanges: 2 1/2 Grain(Starch); 8 1/2 Fat; 5 Other Carbohydrates.