0.5cupunsalted butter, softened to room temperature
0.5cuppacked brown sugar
0.25cupgranulated sugar
1largeegg, at room temperature
1teaspoonpure vanilla extract
1cupsemi-sweet chocolate chips
1cupmini marshmallows
0.5cupcrushed graham crackers
to tasteadditional chocolate chips for topping
Instructions
Preheat your oven to 350°F (175°C).
In a medium bowl, whisk together the all-purpose flour, baking soda, and salt until fully blended. Set this mixture aside.
In a large mixing bowl, using an electric mixer, beat together the softened butter, packed brown sugar, and granulated sugar on medium speed until the mixture is creamy and smooth, about 2-3 minutes.
Add in the egg and vanilla extract to the butter-sugar mixture, mixing on low speed until everything is well combined and smooth.
Gradually incorporate the dry ingredient mixture into the wet mixture, stirring gently by hand until just combined—be careful not to overmix.
With a spatula, fold in the semi-sweet chocolate chips and crushed graham crackers until they are evenly distributed throughout the dough.
Lightly grease a cast-iron skillet or an oven-safe baking dish with cooking spray or softened butter, ensuring a good coating for easy removal.
Carefully spread the cookie dough into the skillet, smoothing the top with a spatula for an even surface.
Place the filled skillet in the preheated oven and bake for 20-25 minutes, or until the edges are golden brown and the center appears slightly soft.
Once baked, remove the skillet from the oven and evenly sprinkle the mini marshmallows and extra chocolate chips over the top.
Return the skillet to the oven and switch to the broiler setting. Broil for an additional 1-2 minutes, keeping a close eye on it to ensure the marshmallows toast and become gooey without burning.
Allow the skillet cookie to cool for about 5 minutes before slicing and serving.
Notes
Serve warm with vanilla ice cream and crushed graham crackers for added texture.