Mississippi Mud Brownies

Bahan-bahan (10 porsi)

• One 4-ounce unsweetened chocolate baking bar, (chopped)
• ¾ cup (1½ sticks) salted butter
• 2 cups granulated white sugar
• 4 large eggs
• 1 cup all purpose flour
• 1½ cups coarsely chopped toasted pecans
• 3 cups miniature marshmallows
• ½ cup (1 stick) salted butter
• ⅓ cup milk
• 6 tablespoons unsweetened cocoa powder
• 16 ounces powdered sugar
• 1 teaspoon vanilla extract