Mix first 3 ingredients in top of double boiler. Add egg to cook and thicken. Remove from heat. Stir in crumbs and coconut. Press firmly into an ungreased 8' x 8" pan. Place in the freezer as you make the next layer.
Second Layer
Cream all together well. Beat until light. Remove pan from freezer and spread mixture over the first layer.
Third Layer
Melt chocolate and butter over low heat. Cool. Once cool, but still liquid, pour over second layer and chill in the refrigerator until set.
Recipe by Life at Cloverhill at https://lifeatcloverhill.com/2009/10/nut-free-nanaimo-bars.html