To a large mixing bowl, add softened butter, brown sugar and vanilla extract. Use a hand mixer on high to cream together until light and smooth (about 2-3 minutes).
½ cup softened unsalted butter, 1 cup dark brown sugar
Add the egg and use your hand mixer on low to combine.
1 tablespoon vanilla extract, 1 large egg
Add the flour, salt, and baking soda and mix to combine, careful not to overbeat. Use a spatula to scrape any flour off the sides of the bowl and integrate it into your dough.
1 ¾ cup all-purpose flour, ¼ teaspoon table salt, ½ teaspoon baking soda
Conserve a small handful of marshmallows to add to the top of the cookies once they are formed. Add the rest of the mini marshmallows to your dough and use a rubber spatula to fold to combine.
1 cup mini marshmallows
Use a large cookie scoop or 2 heaping tablespoons of dough to form your cookies, adding them to the prepped baking sheets. Leave at least an inch of space in between each cookie for minor spreading. Add 2-3 extra marshmallows on top and in the center of each formed cookie.
Bake for 12-14 minutes on the top rack. It's okay if they are slightly underdone. If some of the marshmallows spill over the on the sides, use a spoon to push them back into the cookie while the cookie is still hot. Allow them to cool on the baking sheet. Enjoy!
Notes
You can freeze excess cookie dough before baking it to give you fresh baked cookies every time when the craving hits! Just bake them as normal straight out of the freezer.
Cookie monsters are always happy at my house with this delicious selection of my best cookie recipes to choose from! Nom nom nom!