Step 1: Make the Cookie Dough

Preheat oven to 350°F (175°C). Line baking sheets with parchment paper.

In a large bowl, cream butter, 1 cup peanut butter, granulated sugar, and brown sugar together using an electric mixer for 2–3 minutes until light and fluffy.

Add eggs one at a time, then mix in vanilla extract.

In a separate bowl, whisk together flour, graham cracker crumbs, baking soda, and salt.

Gradually mix dry ingredients into wet mixture on low speed until just combined.

Step 2: Scoop, Flatten & Bake
6. Scoop dough into 1-inch balls and place 2 inches apart on prepared sheets.
7. Flatten each slightly with your palm or a glass bottom.
8. Bake for 10–12 minutes until edges are golden.
9. Cool on the baking sheet for 5 minutes, then transfer to wire racks.

Step 3: Prepare the Filling & Assemble
10. In a microwave-safe bowl, melt chocolate chips and ¼ cup peanut butter in 20-second intervals, stirring until smooth.
11. Let cool 5–10 minutes until slightly thickened, then stir in mini marshmallows.
12. Turn half of the cookies upside down. Add 1–2 teaspoons of filling, then top with another cookie to form a sandwich.
13. Let sit for 30 minutes so the filling can set.