#### Make the Brownies
**Preheat the oven**
Preheat your oven to 350°F (175°C). Grease a 9x9-inch baking pan or line it with parchment paper.
**Mix the batter**
In a bowl, whisk together melted butter and sugar. Add eggs and vanilla extract, whisking until smooth.
**Add dry ingredients**
Sift in cocoa powder, flour, salt, and baking powder. Stir until just combined; do not overmix.
**Bake**
Pour the batter into the prepared pan and spread evenly. Bake for 20–25 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs. Let the brownies cool completely.
#### Prepare the Cherry Layer
**Make the cherry glaze**
In a small saucepan, combine cherries, cherry preserves (if using), cornstarch, and water. Cook over medium heat, stirring, until the mixture thickens and the cherries are softened, about 5 minutes. Let cool.
#### Make the Whipped Cream
**Whip the cream**
In a mixing bowl, beat heavy whipping cream, powdered sugar, and vanilla extract on medium-high speed until stiff peaks form.
#### Assemble the Black Forest Brownies
**Layer the cherries**
Spread the cooled cherry mixture evenly over the brownies.
**Top with whipped cream**
Spread the whipped cream over the cherry layer, smoothing with a spatula.
**Garnish**
Decorate with chocolate shavings, curls, or fresh cherries for an elegant finish.