Pro Tips and Variations
For evenly sized sandwich cookies, I use the same scoop for every dough ball and try to pair cookies of similar size when assembling. If the dough feels very soft or your kitchen is warm, chilling the portioned dough balls for 10–15 minutes before baking can help control spreading.
You can tweak the filling by using milk chocolate or dark chocolate chips instead of semi‑sweet, depending on how sweet you like your s’mores. For extra texture, stir in a handful of crushed graham crackers or chopped peanuts with the marshmallows. You can also roll the finished sandwich cookies’ edges in mini chocolate chips or more graham crumbs for a decorated look.
Storage and Make-Ahead
These sandwich cookies keep well because both the cookies and filling are fairly sturdy. Once the filling has set, I store them in an airtight container at cool room temperature if I’ll serve them within a day, or in the refrigerator for up to 3–4 days for best texture. If chilled, I like to let them sit out for a bit before serving so the filling softens slightly.
For longer storage, you can freeze the cookies. Arrange them in a single layer to freeze until firm, then transfer to a freezer‑safe container with parchment between layers. They typically keep for about a month; thaw in the fridge or at room temperature before serving.
FAQ
Can I use crunchy peanut butter in the cookies?
Yes, crunchy peanut butter will work and will add some extra texture to the cookies, though the dough may be slightly thicker to mix. Smooth peanut butter gives the most classic, even crumb.
Do I have to use graham cracker crumbs in the dough?
The graham crumbs are what give these cookies their s’mores vibe and a unique texture, but if you skip them and use all flour, they’ll be more like standard peanut butter cookies. For the full s’mores effect, keep the graham.
Can I toast the marshmallows?
Mini marshmallows folded into the filling stay soft and chewy, but if you want a toasted flavor, you could use a kitchen torch very lightly on the exposed edges after assembling. Just be careful not to melt the whole filling.
How big should the cookies be?
Using about 1 tablespoon of dough per cookie gives a nice 2–3 bite sandwich that’s easy to eat. You can make them larger if you like, but be sure to adjust baking time and expect a richer, more indulgent treat.
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