Ultimate Fudgy Brownie Pan

Ingredients

• 1 cup (2 sticks) unsalted butter
• 8 oz semisweet chocolate, chopped (or chocolate chips)
• 1 ½ cups granulated sugar
• ½ cup brown sugar, packed
• 4 large eggs, room temperature
• 2 tsp vanilla extract
• 1 cup all-purpose flour
• ½ cup unsweetened cocoa powder
• ½ tsp salt
• 1 cup dark or semisweet chocolate chunks (optional for topping)