Chocolate Marshmallow Treat

This is my Grandmother Cleone's recipe:

1 large package Milk Chocolate Chips
1 cube Margarine
1 egg
Pinch of Salt
1 tsp Milk
1 tsp Vanilla
1 cup Powdered Sugar
1 package Colored Marshmallows
1/2 cup Chopped walnuts
1/2 cup Coconut
1/2 cup Graham Cracker Crumbs

Blend chocolate chips and margarine together. Melt over warm water. Beat egg, salt, milk, vanilla, and powdered sugar. Add to cool chocolate mixture. Pour over marshmallows, nuts, coconut, and graham cracker. Let stand 14 minutes. Roll 10-12 graham crackers until finely crushed. Spread on large piece of wax paper. Divide mixture into half. Let stand 15 minutes. Form into log rolls in cracker crumbs wrapped in wax paper. Keep in refrigerator until read to serve.