• Preheat your oven to 375°F. While it heats, grease an 8x8 inch baking dish or 9-inch square pan with butter or cooking spray, ensuring even coverage on the bottom and sides to prevent sticking and allow for easy removal once cooled.

Pour the larger portion of the red velvet brownie batter (approximately 3/4 of the mixture) into your prepared baking dish, spreading it evenly into the corners to create a solid base layer that will provide structure and a fudgy texture for the brownies.

• In a separate bowl, beat the softened cream cheese with the 1/4 cup sugar until smooth and fluffy, which should take about 1-2 minutes. Add the large egg and 1/2 tsp vanilla, beating until fully incorporated and creamy with no lumps. Carefully spread this cheesecake mixture evenly over the brownie base layer, taking care not to disturb the layer underneath.
• Spoon the reserved 1/4 cup of red velvet brownie batter (from Step 2) in small dollops across the top of the cheesecake layer. Using a thin knife or skewer, gently swirl through the batter in a figure-8 or back-and-forth pattern to create decorative streaks—being careful not to overmix to maintain the distinct layers. The contrast between the red velvet and cream cheese will create a beautiful marbled effect.
• Bake the brownies for 30-35 minutes, until the top is set but still has a slight jiggle in the center when you gently shake the pan. The cheesecake layer should be mostly set, and the edges of the brownie should slightly pull away from the sides of the pan. Once baked, remove from the oven and let cool to room temperature on a wire rack for about 1-2 hours before cutting into squares. For cleaner cuts, I recommend refrigerating these for at least 1 hour after cooling to ensure the layers are fully set and the cheesecake firms up.