Marshmallow Crunch Brownie Bars

INGREDIENTS

• :
• 4 ounces unsweetened chocolate
• 2/3 cup unsalted butter
• 1¼ cups semisweet chocolate chips, divided
• 1-1/3 cups all-purpose flour
• 1 teaspoon baking powder
• ½ teaspoon salt
• 4 large eggs, at room temperature
• 2 cups granulated sugar
• 2 teaspoons vanilla extract
• 1 bag (10½ ounces) miniature marshmallows
• 1½ cups milk chocolate chips
• 1 cup smooth peanut butter (don't use natural peanut butter)
• 1 Tablespoon unsalted butter
• 1½ cups Rice Krispies cereal