I was drawn to these because of the marbled batter and even more so by the buttercream frosting and chocolate drizzle. It seemed to me they'd be a little different than most and they were! The two batters weren't the easiest to swirl because they're thick, but since each is very good it doesn't matter which you get a bite of! As I frosted them I thought it might be overkill and maybe it was, but I wouldn't have them any other way! I eliminated the almond extract, thinking I wouldn't care for it here, and replaced it with more vanilla. I did use the chopped pecans, but only one cup of the amount called for, and I think they are significant to include. With no leavening, these are thinner, chewier and more sturdy bars then some others, more cookie-like than cake-like. My only criticism is of myself. I just couldn't wait to cut into these and didn't have the patience to wait for the chocolate drizzle to set up. I should have, because the chocolate wouldn't have been dragged through the white buttercream frosting and the bars would have looked a lot prettier. The two different flavored batters, the buttercream frosting and chocolate drizzle all came together nicely - this was a pleasant surprise!