The recipe is from an old post here on Cookie Madness, but I cleaned it up and took a new picture. I put the marshmallows and chocolate on near the end so the marshmallows won’t get too chewy and the milk chocolate won’t dry out.
6 oz (170 grams) unsalted butter, cool room temperature
1/2 cup (96 grams) granulated sugar
1/2 cup (100 grams) packed brown sugar
1 large egg
1 teaspoon (5 ml) vanilla extract
1/2 teaspoon (2 ml) salt
1/2 teaspoon (2 ml) baking soda
1 1/4 cups (160 grams) all-purpose flour
1 cup (around 90 grams) graham cracker crumbs
1 1/2 cups (265 grams) semi-sweet chocolate
1 cup miniature marshmallows (approximately)
2 Hershey Bars, broken into pieces (or other favorite milk chocolate)
Preheat oven to 350 degrees F (176 C). Line 2 cookie sheets with parchment paper.
Cream butter and both sugars with an electric mixer; beat in egg and vanilla. Beat in salt and baking soda making sure they are well distributed and free of lumps; stir in the flour, followed by graham cracker crumbs. Stir in chocolate chips.
Drop dough by heaping tablespoonfuls onto cookie sheets, spacing about 3 inches apart. Bake for 9 minutes. Remove and quickly press marshmallows and chocolate into cookies. Return to oven and cook until done (about 3 or 4 more minutes)
Makes about 3 dozen