Pretzel Toffee Chip Brownies

Bahan-bahan (24 porsi)

• 1/2 cup (1 stick) butter
• 2 1 -ounce squares unsweetened chocolate, (chopped)
• 1 cup granulated white sugar
• 3/4 cup all purpose flour
• 2 large eggs, (well beaten)
• 11.5 ounces bittersweet chocolate chips
• 8 ounces toffee chips
• 1 cup broken-up stick pretzels