Line an 8×8-inch baking pan with aluminum foil; set aside.
Place Oreos in a food processor and pulse until ground.
Put the marshmallows and the butter in a large microwave-safe bowl; cook in microwave for 1 1/2 to 2 minutes, or until puffed.
Remove from the microwave and pour in the ground Oreos; stir to combine.
Transfer the mixture to the foil-lined baking pan.
Let set for 10 minutes.
Remove bars out of pan with edges of foil, cut into squares, and thread onto the sticks.
Makes 16 brownie-sized bars.