Preheat your oven to 350°F (175°C). Grease a 9×9-inch baking pan or line it with parchment paper.

In a large bowl, combine the melted butter and granulated sugar. Stir until well mixed, then add in the eggs one at a time, followed by the vanilla extract.

In another bowl, whisk together flour, cocoa powder, baking powder, and salt. Gradually fold this mixture into the wet ingredients until combined.

Stir in the red food coloring until you achieve the desired color.

In a separate bowl, beat the softened cream cheese with granulated sugar until creamy. Add the egg and vanilla extract, mixing until smooth.

Pour ¾ of the brownie batter into the prepared baking pan. Spoon the cheesecake mixture over the brownie layer, followed by the remaining brownie batter.

Use a knife or skewer to swirl the two mixtures gently, creating the marbled effect.

Bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean.

Let the brownies cool in the pan for about 10 minutes before transferring to a wire rack to cool completely.

Once cooled, slice your brownies into squares, serve them up, and enjoy!