I tried Donielle from Naturally Knocked Up's black bean brownies. Yummy guiltless chocolate, and they passed the kid and husband test as well :) The only substitutions I made were I didn't use bittersweet baking chocolate, but instead I increased the cocoa to 6 tablespoons and the butter to 1/2 a cup.
GAPS notes: Black beans and cocoa are technically GAPS illegal, but I think they're 'borderline advanced' foods and are okay for some. Whipping cream is not GAPS legal at all, sorry.
Other notes: One pound of black beans, soaked and cooked, yields exactly 3 batches (6 cups). I did my first batch in an 8x8 glass pan, then the second and third together in a 9x13. Less dishes, and a stockpile in the freezer- win win! Great served with whipping cream (sweetened with honey, and melting because the brownie is still warm. yum.)