Dark Chocolate Brownies 🍫🖤 🧈 ¾ cup unsalted butter, melted 🍫 1 cup dark chocolate chips 🥄 1½ cups granulated sugar 🥚 3 large eggs 🧂 ½ tsp salt 🍫 ¾ cup unsweetened cocoa powder 🥄 ¾ cup all-purpose flour 🧁 1 tsp vanilla extract