Line a 8x8" pan with parchment paper (or spray with cooking spray). Set aside.
In a large microwave safe bowl, melt the white chocolate chips according to package directions.
Once the white chocolate is melted, add the peanut butter and stir until creamy.
Add the rice crispy cereal. Stir until combined. Wait about 5 minutes, stirring occasionally until the chocolate is cooled.
Once the chocolate mixture is cooled, fold in the mini marshmallows and mini chocolate chips.
Pour into the prepared dish and spread out evenly. Once they have set, cut into bars and enjoy!