Imitation Game Guinness Brownies

Ingredients

• Generous ½ cup unsalted butter
• 3½ ounces plus a handful more of regular-size semisweet chocolate chips
• ½ cup cold Guinness (or other dark beer)
• 1 cup all-purpose flour
• Heaping ¼ cup unsweetened cocoa powder
• ¼ teaspoon fleur de sel (sea salt)
• 4 room temperature eggs, lightly beaten
• 1 cup sugar (organic cane sugar if possible)
• 1 tightly packed cup of light brown sugar
• ¾ teaspoon coffee extract
• 1 overflowing cup mini semisweet chocolate chips