German Chocolate.

I'd do a spice cake. The spices complement a traditional Thanksgiving meal in much the same way a pumpkin pie does. Here's a great recipe: 2 cups all-purpose flour 1 1/3 cups sugar 1 tablespoon plus 1/2 teaspoon baking powder 1 teaspoon salt 1 teaspoon cinnamon 1/2 teaspoon nutmeg 1/3 cup shortening 1 cup milk or buttermilk 1 teaspoon vanilla 2 large eggs Sift together flour, sugar, baking powder, salt, cinnamon and nutmeg. Add shortening, milk, and vanilla; beat on slow to medium speed of electric mixer for 2 minutes. Scrape sides and bottom of mixing bowl several times. Beat in eggs and continue to beat for 2 minutes longer. Spoon batter into a generously greased and floured 9x13x2-inch baking pan. Bake at 350° for 40 to 45 minutes. I like a brown sugar frosting with this cake: Brown Sugar Frosting 2 egg whites 1 1/2 cups light brown sugar, firmly packed 1/3 cup cold water 1 tablespoon light corn syrup 1/2 teaspoon salt 1 teaspoon vanilla extract Combine all ingredients in top of double boiler. Beat 1 minute at high speed of electric mixer. Place over rapidly boiling water and cook, beating constantly, 7 minutes or until peaks form. Remove from heat and continue beating until spreading consistency is reached. Frost tops and sides of cooled spice cake.