Place the cereal in large bowl

In a small saucepan, combine the chocolate and peanut butter. Cook over low heat, stirring until the chocolate melts and the mixture is smooth. about 2 minutes

Add the chocolate- peanut butter mixture to the cereal and mix to coat. Spread the cereal mixture onto the bottom and 1 1/2 in. up the sides of a 9 in spring-form pan. Freeze until set, about 10 minutes.

Let the ice cream soften at room temperature just until spreadable, about 10 minutes. Spread ice cream evenly into the chilled crust and freeze until firm at least 4 hours and up to 2 days.