Preheat oven to 375 degrees F (190 degrees C). Grease cookie sheets.
In a medium bowl, cream together the butter, granulated sugar, brown sugar, and vanilla until light and fluffy. Beat in the egg.
In a separate bowl, combine the flour, baking soda, and cinnamon. Gradually blend the dry ingredients into the creamed mixture.
Stir in the marshmallows and chocolate chips.
Drop by teaspoonfuls onto the prepared cookie sheets.
Bake for 8 to 10 minutes in the preheated oven, or until golden brown. Let cookies cool on baking sheet for 5 minutes before transferring to a wire rack to cool completely.
Interesting Facts
This recipe is gluten-free if you use certified gluten-free ingredients.
You can use white or dark chocolate chips in this recipe.
These cookies are best enjoyed warm from the oven.