Begin by gathering a medium saucepan and a spatula. Over low heat, add white chocolate chips and creamy peanut butter, stirring continuously until the mixture is smooth and fully melted—about 5-7 minutes.

In a large mixing bowl, pour in the Rice Krispies cereal. Gradually add the melted mixture, using a spatula to gently fold it into the cereal.

Once cooled for about 15 minutes, fold in mini marshmallows and mini chocolate chips carefully.

Prepare a greased 9x9 inch baking pan and transfer the mixture, pressing it down firmly.

Sprinkle the remaining mini chocolate chips over the top and press them down lightly.

Allow the bars to cool at room temperature for about 30-60 minutes, then cut into squares or rectangles to serve.