For Crust: Combine graham cracker crumbs. cocoa, margarine and sugar in a medium bowl and mix well. Press mixture in a 9x13 baking pan.
For Topping: Microwave 1/2 cup of each: chocolate and peanut butter morsels along with sweetened condensed milk and vanilla in a microwave safe bowl on high for 1 minute. Stir until morsels melt. (may have to microwave 10-20 seconds longer) Pour evenly over crust. Top with chopped nuts and another 1/2 cup of each type morsel. Bake for 20 to 25 minutes at 350 degrees then let cool completely on a wire rack. Cut into bars.
**Note** If you can find peanut butter and chocolate morsels mixed together in 1 bag (it will be 1 cup of mixed morsels in place of 1/2 cup of each type morsel)