1In a medium saucepan, melt the butter over medium heat.
Add the brown sugar to the melted butter and stir until fully dissolved.
Add the peanut butter to the mixture and stir until smooth and well combined.
Remove the saucepan from heat and gently fold in the corn flakes until they are evenly coated with the peanut butter mixture.
Press the mixture into a greased 8x8 inch baking dish, spreading it out evenly.
Allow the mixture to cool and set for about 1 hour.
Once set, cut into bars and serve.