Preheat the oven to 350 degrees. Prepare a 9x9 pan with non stick cooking spray and parchment paper.
Mix the butter, cocoa, salt, and sugar in a large bowl until combined.
Add the eggs, vanilla extract, and vinegar and mix.
Fold in the flour. Before the flour is fully incorporated, add the red food coloring, starting with 7 drops first, then adding more if needed to achieve the desired red color.
Fold in 1/2 cup of white chocolate chips, pour the batter into the prepared baking pan and sprinkle the remaining white chocolate chips on top.
Bake for 22-25 minutes. Let cool for at least an hour.
Cut into squares and serve at room temperature.
Video
Notes
Leftover brownies can be stored in an airtight container at room temperature or in the refrigerator.