Twix Bar Brownies

Ingredients (12)

• 1 pound (4 sticks) unsalted butter
• 16 ounces semisweet chocolate chips
• 6 ounces unsweetened chocolate,
• 2 tablespoons espresso powder
• 7 large eggs
• 2 tablespoons vanilla extract
• 2 1/4 cups granulated white sugar
• 1 1/4 cups all-purpose flour
• 1 tablespoon baking powder
• 1 teaspoon salt
• 12 ounces Twix candy bars
• 1 full-size Twix candy bar,