Heath Bar Fudge Brownies

Ingredients (19)

• FOR THE BROWNIES:
• 4 tbsp 1/2 stick unsalted butter, melted, plus more for greasing the dish
• 1/2 cup Dutch-processed cocoa powder
• 2 oz unsweetened chocolate
• 2 1/4 cups sugar
• 1/2 cup plus 2 tbsp vegetable oil
• 2 large eggs
• 2 large egg yolks
• 1 tsp vanilla extract
• 1 3/4 cups all-purpose flour
• 1 tsp Kosher salt
• 2 8-oz packages Heath toffee bits (about 3 cups)
• 1 cup semisweet chocolate chips
• FOR THE FUDGE ICING:
• 6 tbsp unsalted butter
• 1 1/2 oz unsweetened chocolate
• 1 oz bittersweet chocolate
• 1/4 cup sour cream
• 1/2 cup plus 1/3 cup confectioners sugar