1-Preheat your oven to 350°F (175°C) and grease a baking pan or line it with parchment paper to prevent sticking.

2-In a medium bowl, sift together 1 1/2 cups all-purpose flour, 3/4 cup cocoa powder, 1/2 teaspoon baking powder, and 1/4 teaspoon salt to ensure even distribution of dry ingredients.

3-In a separate large bowl, whisk together 1 cup granulated sugar and 1 1/4 cups melted unsalted butter until combined, then add 4 large eggs one at a time.

4-Follow by adding 2 tablespoons kirsch or other cherry liqueur and 1 teaspoon vanilla extract, mixing well to create a smooth batter.

5-Gradually fold the dry ingredients into the wet mixture, stirring just until incorporated, and then gently fold in the pitted cherries.

6-Pour the batter evenly into the prepared pan and spread it to the edges.

7-Bake in the preheated oven for 25-30 minutes, or until a toothpick inserted in the center comes out with a few moist crumbs.

8-Remove the brownies from the oven and allow them to cool completely in the pan before slicing.

9-For the cherry sauce, combine 2 cups cherries, 1/4 cup granulated sugar, and 2 tablespoons kirsch in a pot, heat until syrupy, thicken with cornstarch mixed in 2 tablespoons water, then cool and swirl into the brownies before baking.