Creating the amazing Chocolate Snickers Cake is straightforward if you follow these steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Grease and flour two 9-inch round cake pans.

2. Mix Dry Ingredients: In a large bowl, combine flour, sugar, cocoa powder, baking powder, baking soda, and salt. Whisk together until well blended.

3. Combine Wet Ingredients: In another bowl, whisk together eggs, milk, vegetable oil, and vanilla extract.

4. Mix Together: Gradually add the wet mixture to the dry ingredients, mixing until just combined.

5. Add Boiling Water: Carefully stir in the boiling water until the batter is smooth. The batter will be quite thin.

6. Divide Batter: Pour the batter evenly into the prepared cake pans.

7. Bake: Place in the preheated oven and bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean.

8. Cool Cakes: Once baked, remove from the oven and let the cakes cool in the pans for about 15 minutes. Then, transfer to wire racks to cool completely.

9. Prepare Caramel Filling: While the cakes are cooling, mix the caramel sauce with the chopped peanuts in a bowl. Set aside.

10. Make Ganache: Heat the heavy cream in a saucepan until it just begins to simmer. Pour it over the chopped chocolate in a bowl and let it sit for 5 minutes. Stir until smooth.

11. Assemble Cake: Once the cakes are completely cool, place one layer on a serving plate. Spread the caramel and peanut mixture over the top.

12. Add Second Layer: Place the second cake layer on top, pressing down gently.

13. Top with Ganache: Pour the ganache over the top layer, allowing it to drip down the sides.

14. Garnish: Sprinkle the top with chopped peanuts and drizzle with additional caramel if desired.

15. Chill: Let the assembled cake chill in the refrigerator for about 30 minutes to set the ganache.