01 -
Use foil or parchment to line the pan, leaving extra along the sides so it's easier to lift out later.
02 -
In a medium or large pot, combine the sugar, butter, and milk. Cook over medium heat, stirring as it thickens and begins pulling away from the sides.
03 -
Keep stirring while it comes to a gentle bubbling foam. This should take about 3 to 4 minutes.
04 -
Take the pot off the heat and mix in the marshmallows and white chocolate chips. Stir until completely melted and smooth.
05 -
Stir in the crushed Oreos quickly, ensuring they're spread evenly. If you want, save some crumbs to sprinkle on top.
06 -
Pour your mixture into the lined pan. Spread it out evenly with a wooden spoon or spatula. Leave it on the counter until it's firm and set.