Step 1

Prep: Start by preheating the oven to 350° F. Then, line a baking sheet with parchment paper or a silicon mat, set it aside.

Step 2

Dough: Next, in a large bowl, cream together the butter and brown sugar. Then, scrape the sides of the bowl down and add the egg and vanilla extract. Mix ingredients well to combine.

Step 3

In a separate bowl, sift together the cornstarch, baking soda, salt, flour, and graham cracker crumbs. Proceed to gradually add the dry ingredients to the butter/sugar mixture while mixing slowly. Mix until just combined, over mixing the flour could result in stiff cookies. After that, gently fold in the marshmallow bits and mini chocolate chips.

Step 4

Bake: Then, scoop the dough into balls and place on the prepared cookie sheet. Use your fingers to lightly press down the tops of the dough balls a little.

Step 5

Place the cookies in the preheated oven and bake for 8-10 minutes. To ensure that the cookies stay chewy and soft, you will want to pull them out of the oven when the cookies are no longer glossy on the top. Do not wait until they are golden brown, the cookies will firm up as they cool.

Step 6

Let the cookies cool on the baking sheet for 5 minutes and then transfer to a wire rack to cool completely. Serve alongside a tall glass of milk and enjoy!