Line an 8x8-inch square baking pan with foil or parchment paper. Set aside.
Add the white chocolate to a microwave-safe bowl, and heat in 30 second intervals, stirring after each one, until melted and smooth.
Add the Rice Krispies, and fold in until completely coated in chocolate.
Pour into the prepared pan and spread out evenly. Refrigerate for 1 - 2 hours until set. Slice into bars and serve.
Notes
These bars can be stored in an airtight container in the fridge for up to 3 weeks. They also freeze well for up to 2 months. Thaw overnight in the fridge before serving.