Using an electric mixer, combine your cream cheese, sugar, egg, and vanilla in a different mixing bowl. Then, whisk all the ingredients till well-combined.
After that, pour the mixture on top of your brownie batter and spread it evenly using a rubber spatula.
Next, drop your reserved and thinned brownie batter over your cheesecake topping and create swirls with the two layers using a butter knife or an offset spatula.
Then, bake your red velvet cheesecake brownies for about twenty-five to thirty minutes. Likewise, you can do so until the brownies cook thoroughly. Afterward, completely cool your red velvet cheesecake brownies in the cooling wire rack before slicing.
Finally, and as always, make sure to serve and enjoy!