Line two baking sheets with parchment paper or wax paper.

Place butterscotch chips and peanut butter in a large microwave safe bowl and heat for 30 seconds on high. Stir, repeating as needed in 30 second increments, until melted and smooth.

Carefully stir in the cornflakes until they are coated with the butterscotch mixture.

Scoop 1 or 2-tablespoon sized scoops of the mixture onto the prepared cookie sheets. Chill to set the clusters, then transfer for a tin or serving plate and enjoy.