Instructions

  1. In a medium-sized saucepan set over medium heat, melt and stir together the butter, sugar and syrup, cooking until the sugar has dissolved; stir in the oats, flour, salt and graham cracker crumbs.
  2. Press slightly more than half of the mixture into a lightly greased 9x9-inch pan, let cool completely.
  3. Preheat oven to 350°.
  4. Sprinkle the chocolate chips evenly over the top, then top with the marshmallows; top with remaining crust mixture.
  5. Bake the bars for 15-20 minutes; remove from the oven and let them rest for 20 minutes, then cut into squares while still slightly warm.