01 -
Set your oven to 350°F (175°C) and get your baking pans lined with some parchment paper.
02 -
Take a big mixing bowl, and with an electric blender, whip together the softened butter, peanut butter, and both sugars. Keep going until it’s all smooth and fluffy, which might take around 2-3 minutes.
03 -
Add the eggs, putting one in at a time and mixing well each time. Pour in the vanilla and mix until everything's completely combined.
04 -
Grab a medium bowl and whisk together the flour, the graham cracker crumbs, some salt, and the baking soda. Make sure it’s evenly mixed.
05 -
Add the flour mixture bit by bit to the wet mixture while mixing at a slow speed. Stop once it's just mixed, and don’t overdo it.
06 -
Scoop up about 1 tablespoon of dough per piece (you can use a spoon or a cookie scoop). Form into 1-inch balls, space them about 2 inches apart on the sheets, and press them down slightly with your hand or a glass bottom.
07 -
Let the cookies bake for 10-12 minutes. You’ll know they’re ready when the edges are golden but the centers still look a little soft. Don’t overbake—let them firm up during cooling.
08 -
Take the cookies out and leave them to cool on the baking trays for five minutes. After that, move them onto a wire rack to cool completely.
09 -
While waiting for the cookies to cool, grab a bowl that's safe for the microwave. Toss in the chocolate chunks and peanut butter, microwaving it in 20-second bursts. Stir between each interval until it's melted and smooth.
10 -
Let the chocolate mixture cool a bit but not so long that it hardens. Stir in the mini marshmallows and leave it for 5-10 minutes to thicken into a spreadable consistency.
11 -
Flip over half the completely cooled cookies. Spread 1-2 teaspoons of filling on the bottoms, then top each one with another cookie, pressing lightly to create sandwiches.
12 -
Allow the assembling process to set for 30 minutes or so. After that, they’re ready to serve, and the filling will hold better when eating.