Making the Caramel Filling & Drizzle

1. Begin by making the caramel, as it needs time to cool and thicken. Place a saucepan over medium heat.
2. Gradually pour in the sugar, adding ¼ cup at a time. Wait until the sugar begins to liquefy before adding the next portion.
3. Stir occasionally as the sugar melts and turns an amber color. If it starts to burn, remove from heat and lower the temperature.
4. Once fully melted, turn off the heat and slowly add the butter in two-tablespoon increments, stirring continuously.
5. Carefully pour in the heavy cream and add the salt. Stir until smooth. The caramel will be thin but will thicken as it cools.
6. Transfer the caramel to a separate container and let it reach room temperature.
7. Once cooled, whip the caramel with a hand mixer for 1-2 minutes until lighter in color and thicker.
8. Reserve ⅓ cup of the caramel for drizzling. Fold the chopped peanuts into the remaining caramel and set aside.

Baking the Chocolate Cupcakes

1. Preheat the oven to 350°F (175°C) and line a cupcake pan with 12 liners.
2. In a small bowl, combine the warm water and instant espresso (if using). Stir until dissolved.
3. In a separate bowl, melt the chocolate chips in the microwave in 20-second intervals, stirring between each. Let cool slightly.
4. In a large mixing bowl, whisk together the cocoa powder, eggs, vegetable oil, vanilla extract, and white vinegar. Add the melted chocolate and coffee mixture.
5. Sift in the flour, sugar, baking soda, and salt. Stir until just combined. Avoid overmixing, as this can make the cupcakes dense.
6. Divide the batter evenly among the cupcake liners, filling each about ⅔ full.
7. Bake for 16-18 minutes or until a toothpick inserted in the center comes out clean.
8. Allow the cupcakes to cool in the pan for 5 minutes before transferring them to a wire rack to cool completely.

Preparing the Peanut Butter Buttercream

1. In a large bowl, beat the butter and peanut butter together on medium speed until smooth and creamy.
2. Add the vanilla extract and salt, mixing until combined.
3. Gradually add the powdered sugar, one cup at a time, beating on low speed to prevent a sugar cloud.
4. Pour in the heavy cream and increase the speed to high. Beat for 2-3 minutes until the frosting is light and fluffy.

Making the Chocolate Drip (Optional)

1. Heat the heavy cream in the microwave for about 30 seconds or until warm but not boiling.
2. Pour the hot cream over the chocolate chips in a small bowl. Let sit for a minute, then stir until smooth.

Assembling the Cupcakes

1. Use a knife or cupcake corer to create a small hole in the center of each cupcake.
2. Fill each hole with the peanut caramel mixture.
3. Pipe the peanut butter buttercream onto the cupcakes using an open star piping tip for a decorative swirl.
4. Drizzle with the reserved caramel and the chocolate ganache.
5. Top with chopped peanuts and a mini Snickers piece for garnish.