Marbled Brownies - cooking recipe

Ingredients

2 oz. unsweetened chocolate
2 1/4 c. flour
2 tsp. baking powder
3/4 tsp. salt
12 Tbsp. unsalted butter
1 c. granulated sugar
1 c. light brown sugar
1 tsp. vanilla extract
3 eggs

Preparation

Heat oven to 325\u00b0.
Butter a 9-inch baking pan. Chop and melt chocolate. Cool.