In a large mug, whisk together the milk, vinegar, flour, sugar, cocoa powder, baking powder, salt, vegetable oil, and red food coloring. Fold in mini chocolate chips, and give it 1 more stir. Add a dollop of cream cheese right in the center of the batter, and push it down so it's submerged completely.
Microwave on high for 5 minutes or until a toothpick inserted in the center comes out clean.
Garnish with powdered sugar and sprinkles. Enjoy immediately.