Makes 16 squares
unsalted butter, plus more for the pan
- Butter an 8-inch square baking pan and line with parchment, leaving an overhang on two sides.
- In a large saucepan, cook the butter and marshmallows over medium heat, stirring, until melted. Mix in the cornflakes and cinnamon.
- Press the cornflake mixture evenly into the prepared pan. Let cool completely, then lift out and cut into squares.