Good-Cooking - Peanut Cake Bars

Ingredients

• 1 (18 1/4 ounce) box chocolate cake mix
• 1/2 cup water
• 1/3 cup butter or margarine, softened
• 1 egg
• 3 cups miniature marshmallows
• 1 (10 ounce) package peanut butter chips
• 2/3 cup light corn syrup
• 1/4 cup butter or margarine
• 2 teaspoons vanilla extract
• 2 cups crisp rice cereal
• 2 cups salted peanuts