Make the blondie batter and evenly spread it into an 8x8 baking pan.
Then make the brownie batter and spread it on top of the blondie layer in the pan.
Dollop the rest of the blondie batter on top by the spoonful.
Use a toothpick or skewer to swirl the batters together. Top with chopped chocolate.
Bake at 350 for 25-26 minutes. Cool completely then cut into bars and enjoy!