Preheat oven to 350°. Prep three 8” or 9" pans by lining bottoms with parchment, then spray pans with oil. Melt chocolate in water in double boiler (or bowl set over water in a pan), set aside. Mix Pamela’s Artisan Flour Blend, soda and salt. In bowl of stand mixer, blend butter and sugar until light and fluffy. Add yolks, one at a time, beating after each. Add chocolate and vanilla and mix well. Add flour mixture and buttermilk alternately, beating after each until smooth. Whip egg whites in separate bowl until stiff peaks form. Gently fold into batter until combined. Divide evenly between pans. Bake for 30 to 35 minutes or until cakes springs back with a gentle touch in center. Cool for 15 minutes before turning out onto racks.
Beat together cream cheese, butter, 1/2 cup powdered sugar and melted chocolate. Crumble 1 1/2 layers into the bowl and mix well. Knead slightly and make oval shapes, forming the nose by thinning that area. Make about 3 dozen mice, arranging on wax paper lined baking sheet. Press a toothpick into the tail of each and refrigerate until firm, at least thirty minutes. In a separate bowl very finely crumb remaining cake. Heat remaining white and bittersweet chocolate together. Dip mice into melted chocolate and roll in fine crumbs. Press 2 pumpkin seeds into the head for ears and refrigerate until firm. Add tails and eyes.
Recipe adapted from Food & Wine Magazine.