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1. Preheat your oven to 350°F (175°C). Grease a 9×13 inch baking pan or line it with parchment paper for easy removal.
2. In a medium saucepan, melt the butter over low heat. Once melted, remove from heat and let it cool slightly.
3. In a large mixing bowl, combine the melted butter and granulated sugar. Stir until well combined and the mixture is smooth.
4. Add the eggs, one at a time, mixing well after each addition. Then stir in the vanilla extract until fully incorporated.
5. In a separate bowl, whisk together the flour, cocoa powder, baking powder, and salt until evenly mixed.
6. Gradually add the dry ingredients to the wet ingredients, stirring until just combined. Be careful not to overmix.
7. Fold in the semi-sweet chocolate chips and chopped peanuts, ensuring they are evenly distributed throughout the batter.
8. Pour the brownie batter into the prepared baking pan, spreading it evenly with a spatula.
9. Bake in the preheated oven for 25-30 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs (not wet batter).
10. Once baked, remove the brownies from the oven and allow them to cool in the pan on a wire rack for about 15-20 minutes.
11. While the brownies are cooling, prepare the caramel layer. In a small saucepan, gently heat the caramel sauce over low heat until it is warm and pourable.
12. Once the brownies have cooled slightly, carefully spread the warm caramel sauce over the top of the brownies, ensuring an even layer.
13. Sprinkle the chopped Snickers bars evenly over the caramel layer, pressing them down gently to ensure they stick.
14. In a microwave-safe bowl, melt the additional chocolate chips in 30-second intervals, stirring in between until smooth and fully melted.
15. Drizzle the melted chocolate over the Snickers and caramel layer, creating a decorative pattern. You can use a piping bag or a zip-top bag with a corner snipped off for more control.
16. Finally, drizzle the additional caramel sauce over the top for an extra touch of sweetness.
17. Allow the assembled brownies to cool completely in the pan at room temperature. This will help the caramel and chocolate set properly.
18. Once cooled, lift the brownies out of the pan using the parchment paper (if used) and place them on a cutting board.
19. Using a sharp knife, cut the brownies into squares or rectangles, depending on your preference. Wipe the knife with a damp cloth between cuts for cleaner edges.
20. Serve the Snickers brownies on a platter or individual dessert plates. They can be enjoyed warm or at room temperature.
21. Store any leftovers in an airtight container at room temperature for up to 3 days, or refrigerate for longer freshness.

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