Follow these steps to create your Red Velvet Cheesecake Halloween Treat:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Grease and flour a 9-inch springform pan.
2. Prepare Red Velvet Cake Batter: In a large mixing bowl, sift together flour, sugar, baking soda, salt, and cocoa powder.
3. Combine Wet Ingredients: In another bowl, whisk together vegetable oil, buttermilk, eggs, red food coloring, vanilla extract, and vinegar.
4. Mix Ingredients: Gradually add the wet ingredients to the dry ingredients, mixing until well combined and smooth.
5. Bake the Cake: Pour the batter into the prepared springform pan. Bake for 25-30 minutes or until a toothpick inserted in the center comes out clean. Allow the cake to cool completely in the pan.
6. Prepare Cheesecake Layer: In a mixing bowl, beat the softened cream cheese until smooth. Gradually add sugar and continue mixing until fluffy.
7. Add Eggs and Flour: Add the eggs one at a time, mixing well after each addition. Finally, add flour and vanilla extract, mixing until just combined.
8. Layer the Cheesecake: Once the red velvet cake has cooled, pour the cheesecake batter on top of the cake in the springform pan.
9. Bake the Cheesecake: Bake for an additional 20-25 minutes or until the cheesecake is set but still slightly jiggly in the center.
10. Cool and Chill: Remove from the oven and let it cool at room temperature for about an hour. Then refrigerate for at least 4 hours or overnight.
11. Prepare Cream Cheese Frosting: In a large bowl, beat the softened cream cheese and butter until smooth. Gradually add powdered sugar and vanilla extract, mixing until creamy. Add milk if needed for a spreadable consistency.
12. Frost the Cheesecake: Once chilled, carefully remove the cheesecake from the springform pan and frost the top with the cream cheese frosting.
13. Decorate: If desired, add Halloween-themed decorations, such as sprinkles, candy, or edible eyes.