01 -
Heat oven to 350°F. Melt butter in microwave for 40 seconds.
02 -
Stir melted butter with both sugars until smooth. Add vanilla and egg, mix well.
03 -
Mix in flour, baking soda, and salt until just combined. Dough should be soft but not too sticky.
04 -
Fold in chocolate chips, marshmallow pieces, and graham crumbs.
05 -
Scoop 3 tablespoons dough per cookie. Place 2 inches apart on baking sheet.
06 -
Cook 10-15 minutes until set but still soft in middle.