In a medium mixing bowl, sift the flour, cocoa powder, baking soda, baking powder, and salt. Gently whisk and set aside.

In a large mixing bowl, add the granulated sugar, brown sugar, butter and vanilla and beat with a hand mixer for about 2 minutes. The sugars and butter should resemble cream.

Next, add the egg and yolk, and beat until well combined (for about 1 minute).

Then, add your "sifted flour mixture" into your wet batter and mix with a wooden spoon or rubber spatula until combined. Be sure not to over mix. Next, fold in your chocolate.

Transfer the cookie dough to a fridge and let chill for at least 2 hours (up to 48 hours) to allow the flour to hydrate.

Preheat your oven to 350°F and line a nonstick baking sheet with parchment paper. Remove your chilled dough from the refrigerator and use a medium cookie scoop (2 tablespoons cookie scooper) to scoop the dough. With your thump, make an indention in the dough while the dough is in the scooper and insert half of a marshmallow into the indention. Once inserted, release the cookie and form into a ball. The dough should completely cover the cookie (Pro tip: if your cookie has a marshmallow explosion after it bakes, you can reshape it with a cookie cutter).

Next, in a shallow bowl, mix your sugar topping ingredients until fully incorporated and roll each ball into the sugar mixture. Then, place the balls onto the parchment lined baking sheet. The dough should be about 2  inches apart.

Bake the cookies in the preheated oven for 8-10 minutes or until the edges of the cookies are set and the center is slightly puffed. Reshape the cookies into a perfect circle by using a biscuit cookie or glass bowl that is slightly larger than the cookie. Once the cutter or bowl is placed around the cookies, swirl it in a circular shape until it forms a perfect circle. Cookies must still be hot. Let rest for about 10-15 minutes or until set.

Once cooled, enjoy and feel free to add a comment on my blog! Also, be sure to share your photo on instagram and tag @‌butterloveandsalt! We would love to see how your cookies come out!