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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, sift together the all-purpose flour, cocoa powder, baking powder, and salt.
6. Gradually add the dry ingredients to the wet mixture, stirring gently until just combined. Be careful not to overmix.
7. Fold in the semi-sweet chocolate chips and pitted cherries. If using cherry liqueur, add it at this stage and mix until evenly distributed.
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.
10. Once baked, remove the brownies from the oven and allow them to cool in the pan for about 10 minutes. Then, transfer them to a wire rack to cool completely.
11. While the brownies are cooling, prepare the whipped cream. In a large mixing bowl, add 1 cup of heavy cream and 2 tablespoons of powdered sugar (adjust to taste).
12. Using an electric mixer, beat the cream on medium-high speed until soft peaks form. Be careful not to overwhip.
13. Once the whipped cream is ready, set it aside in the refrigerator to keep it chilled until you are ready to serve.
14. Once the brownies have cooled completely, cut them into squares or rectangles.
15. To serve, place a brownie square on a plate. Top it generously with a dollop of whipped cream.
16. If desired, drizzle some additional cherry liqueur over the whipped cream.
17. Garnish with chocolate shavings for a decorative touch and added richness.
18. Repeat the process for the remaining brownie squares, serving them fresh and warm.

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