Step 1 — Make the Cookie Dough
In a large bowl, cream butter, brown sugar, and granulated sugar together until smooth and fluffy.
Add eggs one at a time, mixing after each addition. Stir in vanilla extract.
In another bowl, whisk flour, baking soda, and salt. Gradually mix dry ingredients into the wet mixture until just combined.
Step 2 — Add the S’mores Mix-Ins
Fold in chocolate chips, crushed graham crackers, and mini marshmallows.
Chill the dough for 30 minutes — this helps prevent spreading and keeps the marshmallows from melting too fast.
Step 3 — Bake the Cookies
Preheat your oven to 350°F (175°C).
Line a baking sheet with parchment paper and scoop dough into balls, spacing them 2 inches apart.
Bake for 10–12 minutes, until edges are golden and centers are soft.
Press a few extra marshmallows or chocolate pieces on top right after baking for a bakery-style look.
Step 4 — Cool and Serve
Let cookies cool for 5 minutes on the tray, then transfer to a rack.
Serve warm for maximum gooeyness, or store once fully cooled.