For the Cake:

• 2 1/4 cups 293g all-purpose flour
• 2 1/2 tsp baking powder
• 1/4 tsp baking soda
• 1/2 tsp salt
• 1/2 cup 112g unsalted butter, room temperature
• 1/2 cup vegetable oil
• 1 1/2 cups 310g sugar
• 1 tbsp vanilla extract
• 4 large eggs
• 1 cup 240ml buttermilk*
• 5 oz bittersweet chocolate (60% cacao, chopped**)
• Black gel icing color
• Red gel icing color

For the Chocolate Buttercream:

• 2 1/4 cups 504g unsalted butter
• 8 cups 920g powdered sugar
• 1 cup 114g natural unsweetened cocoa powder
• 2 tsp vanilla extract
• 5 -7 tbsp (75-105ml water or cream)
• 1/4 tsp salt
• Black gel icing color

For the Red Drip & Decoration:

• 4 oz red Wilton candy melts
• 2 tbsp heavy whipping cream
• Halloween sprinkles (bones, eyeballs, spiders, etc.)