A soft, peanut-buttery cookie with gooey marshmallow ribbons, built for anyone who ever licked a spoon after making a sandwich they weren’t supposed to eat before dinner.
Dollop the marshmallow fluff over the top of the dough. Don’t stir it in all the way. Just fold gently until you see ribbons. You’re swirling, not blending. This will be a sticky dough.
1/2 cup marshmallow fluff
Use two spoons or wet fingers to form dough into 2½ to 3 tablespoon portions (about 12 cookies).
Bake at 350°F for 13 to 15 minutes, until the edges are set but the centers still look a little soft. The marshmallow may brown and spread. That’s a feature, not a flaw.
Let them cool on the pan for a few minutes before moving. These are a very soft, pliable cookie even when cool.
Notes
This is a sticky dough.
Use parchment paper or non-stick foil.
Don’t use much more than 1 cup of marshmallow fluff. The cookies will be too soft, even after they have cooled.
1/2 cup of mini marshmallows can be substituted, but you get melted marshmallow pockets and lose the marshmallow swirls.
Cookies will keep for a few days in an airtight container, but they’re best eaten the day they’re baked.
You can freeze scooped dough balls and bake straight from frozen, add 1–2 minutes to the baking time.