These came out gummy because they'd bake better in a 9x13 pan in my opinion. I'd also do either two layers of batter instead of four, or alternate large blobs of each batter in the pan, then run a knife through them. The chocolate layer is stiff, while the pumpkin is watery, so it's difficult to swirl if you make four layers as instructed. You can read more reviews of this recipe on marthastewart.com
soooooooo tasty! the cayenne is an ingenious twist. had some trouble spreading the chocolate layer and marbling, but then again, i'm no martha stewart. be warned--this will dirty every dish in the kitchen, but it's WORTH IT!