Pre-Heat oven to 350°F. Spray a Bundt pan with baking spray. Set aside. Add eggs and sugar to a large bowl or the bowl of a stand mixer. Beat on high speed for for 3-4 minutes until fluffy. Add in oil, vanilla and buttermilk. Beat until incorporated. Add cocoa powder and mix. Add flour, baking powder and baking soda, 1/2 box pudding (optional) and beat again. Stir in boiling water or coffee. Set aside.
Pumpkin Cake
Add egg, egg white and sugar to a large bowl or the bowl of a stand mixer. Beat on high speed for for 3-4 minutes until fluffy. Add in pumpkin purée, oil, butter, vanilla, sour cream and buttermilk. Beat until incorporated. Add pumpkin spice, flour, baking powder and baking soda, and beat again. Set aside.
Assembly
Spoon half of the chocolate batter into the Bundt pan. Spoon in half of the pumpkin batter on top of the chocolate batter. Repeat the process with the remaining batter. Bake 45-50 minutes until done. The batter will not look wet and when inserting a toothpick, no batter will remain on it. Cool completely.Spoon on chocolate glaze and add fondant spider decoration to the top.
Chocolate Glaze
Add powdered sugar and cocoa powder to a small bowl and stir. add the milk one tablespoon at a time and stir until it is at a pourable consistency.
Fondant Spider
Break off a piece of the fondant for the body, about 2 thirds of the size of the palm of your hand. Roll the fondant in your hands to make an egg shape. Break off a second piece about 1/3 of the side of the first fondant piece. Roll it into a ball and press it to the front of the larger piece. Pinch off 4 small pieces and roll into ropes twice the length of the width of the spider bodies. Place the ropes down on a board crossing them in the middle like “X’s”. They should look like there are 4 spider legs on each side. Place them under the spider’s body and press down so that they stick together.