Preheat the oven to 350°F (175°C) and prepare a baking pan.
Melt the butter and combine it with sugar in a large bowl.
Add eggs one at a time, mixing until well incorporated.
Sift in the cocoa, flour, salt, and baking powder.
Fold in any mix-ins like chocolate chips, if desired.
Pour the batter into the prepared baking pan and spread evenly.
Bake for 25-30 minutes, until a toothpick comes out with moist crumbs.
Allow the brownies to cool completely in the pan.
While cooling, prepare the fruit and whipped cream topping.
Once cooled, spread whipped cream over the brownie base.
Artfully arrange the assorted fruits on top.
Garnish with mint leaves, if desired, and serve.