I'll admit I'd never heard of nanaimo bars in my life. But hey, that's what being a Daring Baker is all about! I did change things up a bit, adding a generous shot of rum into the base layer, using only pecans and graham cracker crumbs (I dislike the coconut-chocolate combination), and swapping homemade dulce de leche for the buttercream. Since everyone on the forum had been commenting on how rich these were, I also cut them into bite-size pieces, more like candies than bars.
I think I crushed my graham crackers too fine, because I could barely taste them in the finished product. The verdict: tasty (with chocolate, rum, pecans, caramel - what's not to like?), and a novelty, but I may not make these again.