s'mores rice krispy treats

the goods:

4 tablespoons unsalted butter

7 cups mini marshmallows

1 teaspoon vanilla

3 cups rice krispy cereal

2 cups golden grahams cereal

3/4 cup chocolate chips (semi-sweet or milk chocolate)

In a large bowl, combine rice kristy cereal, golden grahams cereal, and chocolate chips. In a medium saucepan, melt the butter over medium heat. Turn burner to the lowest heat possible and add the marshmallows, stir until almost completely melted, then stir in vanilla. Continue stirring until marshmallows are completely melted and smooth.
Lightly grease a 9x9-inch pan. Pour hot marshmallows over cereal and stir to combine. Dump directly into the prepared pan. Lightly grease your hands and press krispies into the pan. Allow to cool and set, at least 20 minutes.