Red Velvet Brownies with Chocolate Lovers' Frosting

INGREDIENTS

1 cup

all-purpose flour

1/2 tsp

baking powder

1/4 tsp

salt

2 oz

bittersweet chocolate, chopped

1/2 cup

unsalted butter, diced into 6 pieces

1 1/4 cups

granulated sugar

1 1/2 tbsp

liquid red food coloring

1 1/2 tsp

vanilla extract

1 tsp

apple cider vinegar

large eggs

8 oz

bittersweet chocolate or milk chocolate chips

2 1/2 sticks

butter, softened

3/4 cup

unsweetened cocoa powder (Hershey’s Special Dark Cocoa)

salt

3/4 cup

light corn syrup

1 tsp

vanilla extract