*I use the microwave method, but the stopover method would work just fine.
Melt butter and marshmallows in the microwave for about three minutes, stirring at a minute and a half.
When marshmallows are good and melted, add the rice krispies and crumbled brownies.
Mix well until all is completely combined.
Pour mixture into a well greased, or wax paper lined pan. (size is up to you, depending on how thick you want them - I used 13"x9").
Allow to cool and set for at least one hour. Can be placed in the refrigerator to speed the cooling process.
Turn over onto a cutting board and cut into squares.