1 cup all-purpose flour
1 cup brown sugar, packed
1/2 teaspoon salt
1/2 teaspoon baking soda
1 1/2 sticks butter, melted
1 cup semi-sweet chocolate chips
3 cups miniature marshmallows
Preheat oven to 350ºF. Line a 9 x 13 pan with aluminum foil and spray with cooking spray- make sure to spray the sides as well.
In a mixing bowl, combine the oats, flour, brown sugar, salt and baking soda. Mix well to combine. Add the melted butter to the oat mixture and stir together. Press the mixture into the bottom of your 9 x 13 pan. Bake at 350ºF for 15 minutes, remove from the oven.
Sprinkle with half of your chocolate chips, then all of the marshmallows, and finally, the last 1/2 cup of chocolate chips. Place back in the oven and bake for another 7-10 minutes, or until the marshmallows are lightly golden brown.
Cool in the pan on a wire rack.
To cut into bars, remove the bars from the pan, using the foil to pull it out and set the bars on a cutting board. Spray a knife with cooking spray before cutting the bars evenly. Cut into 24 bars, spraying the knife again as needed.