Preheat your oven to 350°F and spray an 8x8 inch baking pan with non-stick spray.
Mix the brownie ingredients: sugar, flour, cocoa powder, salt, baking powder, oil, vanilla, and eggs until smooth.
Pour half of the brownie batter into the prepared pan.
In a separate bowl, beat cream cheese, sugar, egg, vanilla, and food coloring until creamy.
Drop dollops of cream cheese mixture onto the brownie batter, then swirl gently.
Pour remaining brownie batter over the top and swirl again for a marbled effect.
Bake for approximately 35 minutes until a toothpick inserted in the center comes out clean.
Let cool, then decorate with sprinkles and colored frosting for a festive look.