Preheat your oven to 350°F (175°C) and grease a 9×13-inch baking dish thoroughly to prevent sticking.

2. Prepare the Brownie Batter

In a large bowl, combine melted butter and sugar, whisking until fully incorporated. Add the eggs one at a time, beating well after each addition, then mix in the vanilla extract. In another bowl, mix flour, cocoa powder, and baking powder. Slowly mix the dry ingredients into the wet mixture, stirring only until no dry streaks remain.

3. Make the Cheesecake Mixture

In a medium bowl, beat cream cheese and ⅓ cup sugar until smooth. Add in the egg and mix until just combined. Gently fold in the drained cherries. Thoroughly drain the cherries to prevent excess moisture from affecting the cheesecake layer.

4. Assemble the Layers

Pour and spread the brownie batter evenly into the greased baking dish. Spoon the cheesecake mixture over the top and use a butter knife to swirl gently, creating a marbled effect.

5. Bake

Bake for about 45 minutes, or until the center is just set and a toothpick inserted in the brownie layer comes out mostly clean. Allow the brownies to cool completely before slicing for cleaner, more precise cuts.