01 -
Preheat oven to 350°F (175°C). Line a 15x10 inch pan with parchment paper or grease with butter and dust with flour if preferred. Lining with parchment makes it easier to cut the brownies.
02 -
Melt unsweetened chocolate and butter over low heat while stirring to avoid scorching. Let the mixture cool to room temperature.
03 -
Beat in the eggs and salt until the yolk is incorporated. For lighter brownies, beat until the mixture is light and fluffy. Otherwise, stop once combined for a dense, fudgy texture.
04 -
Stir sugar and vanilla extract into the cooled chocolate mixture. Gradually fold in the flour until gently combined.
05 -
Spread the batter evenly in the prepared pan and smooth the top. Bake for approximately 20 minutes or until the top is shiny and puffy. A toothpick inserted should come out with some batter on it but ensure the batter is well set before removing.
06 -
Let the brownies cool on the counter and then transfer to the refrigerator to chill overnight.
07 -
Mix softened butter and brown sugar until well combined. Add vanilla extract and salt, stirring thoroughly. Gradually mix in powdered sugar and chocolate chips until the mixture is smooth and spreadable.
08 -
Remove the chilled brownies from the pan using the parchment paper. Slice in half widthwise to create two halves approximately 7x10 inches each. Spread the cookie dough filling evenly over one half and place the other half on top, shiny side up. Press gently and cut into small bars.