Instructions

• Heat oven to 350°F.
  
• Line an 8-inch square pan with parchment.
  
• Melt butter and chocolate together until smooth; cool 5 minutes.
  
• Into the melted chocolate, Whisk in both sugars, eggs, and vanilla.
  
• Combine dry ingredients and sift or mix until incorporated.
  
• Fold in flour, cocoa, and salt just until no dry streaks remain.
  
• Spread batter in the pan and bake 28 to 33 minutes, until the edges are set and the center is still slightly fudgy.
  
• Cool before cutting.