This popular Canadian bar cookie has a cake-like base made with graham cracker and nuts, a creamy filling of buttercream, and is covered with a brittle chocolate topping. Basically, Nanaimo bars are glorified brownies that are over the top with both butter and sugar. They're delicious, rich and indulgent...and would make for an irresistible addition to your holiday table or a memorable dessert to take to a potluck. Adapted from a recipe found in an old issue of Sunset Magazine.