Preheat the oven to 350 degrees F.
In a microwavable container add the dark chocolate chips and butter. Microwave in 30 second intervals stirring between each until it is fully melted and smooth. Set aside to cool.
In a large separate bowl, combine the eggs, sugars, vanilla, milk, and food coloring. Mix until fully incorporated.
Once the chocolate is cooled to lukewarm or colder stir the chocolate into the sugar and egg mixture.
Sift into the large bowl the salt, baking powder, cocoa powder, and flour. Mix thoroughly but do not over stir.
Fold in white chocolate chips.
Pour the batter into a greased metal 9x13" baking pan and bake for 30-35 minutes or until a toothpick inserted in the center comes out clean.
Cool completely then ice if desired and cut into 16 squares for serving.