Fluffernutter Brownies are what you bake when you and I want ultra‑fudgy, bakery‑style brownies loaded with swirls of creamy peanut butter and gooey marshmallow fluff. This version uses a from‑scratch cocoa brownie base enriched with melted butter, sugar, and chocolate chips, then layers peanut butter and marshmallow between two brownie layers for that iconic fluffernutter sandwich vibe in dessert form.
Why you’ll love these Fluffernutter Brownies
These brownies are deeply chocolatey and fudgy thanks to a cocoa‑based batter, espresso powder, and melted chocolate chips, so they never taste like a plain “topped” brownie bar. The peanut butter and marshmallow fluff create gooey ribbons through the center that stay soft even after the brownies cool, giving you a mix of chew, melt, and stretch in every bite.
The method is still very approachable: you whisk the dry ingredients, cook the butter and sugar to heighten gloss and texture, then build a simple layer–filling–layer structure in a 9×13 pan. There’s no mixer required, and the results slice cleanly into impressive squares perfect for parties, bake sales, or nostalgic after‑school treats.