Grease a 9-inch square baking pan with sesame oil.
In a large pot, melt the butter over medium-high and cook, stirring occasionally, until the milk solids at the bottom of the pan start to brown, 2 to 3 minutes. Reduce the heat to low and add the sesame seeds. Cook, stirring constantly, until the seeds smell toasty, 1 to 2 minutes.
Add the marshmallows and salt and stir until melted, about 5 minutes. Turn off the heat and stir in the 2 teaspoons sesame oil.
Add the cereal and quickly stir until evenly coated. Immediately press into the greased pan.
Let cool for at least 10 minutes before flipping out onto a cutting board and slicing into squares. The treats can be stored in an airtight container for up to 4 days at room temperature.
