[header] How to make cookies and cream rice krispie treats [title] Melt the butter in a large saucepan. [step] Over a low heat setting, melt the butter to where it is nearly all liquid. [title] Add the marshmallows. 
[step] Combine and stir the butter and marshmallows until everything is melted thoroughly. [title] Remove the pan from the heat and add the 10 oreos that were chopped.