Heat oven to 350 F.
Line a 13×9-inch vessel with foil. Grease generously.
Place 1 crater unsalted butter and baking chocolate in microwave-safe play and prepare in x-ray in brief bursts, stirring intermittently, until all is melted and combined, regulating caring not to whip a chocolate.
Transfer to a blending bowl, stir in sugars and vanilla; brew well.
Add eggs, one during a time, violence good with a ladle after any addition. Add flour and salt; kick well.
Stir in mini chocolate chips and peanut butter chips. Pour beat into pan. Bake 30 to 35 mins or until brownies start to lift divided from sides of pan. Remove from oven and allegation hazelnut widespread on comfortable brownies. Sprinkle dejected cookies over a top. Set aside.
In a vast saucepan, warp remaining 3 tablespoons butter. Add marshmallows and stir until totally melted. Remove from heat. Add rice cereal and stir until good coated. Using a buttered spatula, uniformly press reduction on tip of dejected cookie layer. Cool. Spread Peanut Butter Frosting over a tip and shower with toppings. Cut into bars.
Makes 3 dozen.
Peanut Butter Frosting: With an electric mixer, brew 1/2 crater malleable butter and 1 crater tawny peanut butter. Gradually brew in 2 cups powdered sugar, afterwards supplement 3 tablespoons milk, 1 tablespoon during a time as a reduction thickens. Beat for during slightest 3 minutes, until fluffy.
PER SERVING: 364 calories, 20 g fat (10 g sat fat), 44 mg cholesterol, 113 mg sodium, 42 g carbohydrates, 1 g fiber, 31 g sugar, 5 g protein