Gluten Free Peanut Butter Marshmallow

The smell of melted peanut butter is one of those things that can pull me into a kitchen faster than any alarm clock, and these chewy little squares came together one rainy Tuesday when I needed something sweet without turning on the oven.

My neighbor stopped by unannounced the afternoon I first tested these, and she ended up leaning against the counter eating three squares while telling me about her garden.

Ingredients

• Creamy peanut butter (1 cup): Use a brand you trust and always check the label to confirm it is gluten free, because some additives sneak in where you least expect them.
• Unsalted butter (1/2 cup): Butter adds richness and helps the mixture set with that satisfying chewy texture.
• Gluten free powdered sugar (1 1/2 cups): This sweetens and thickens the base, so sift it if it looks lumpy.
• Pure vanilla extract (1 teaspoon): A small amount rounds out the flavor and makes everything taste more homemade.
• Mini marshmallows (3 cups): Certified gluten free marshmallows are essential since some brands dust theirs with wheat based powder.
• Gluten free chocolate chips (1/2 cup, optional): Scatter these on top if you want a little chocolate without going overboard.

Instructions

Prep the pan:

Line an 8x8 inch baking pan with parchment paper, leaving overhang on two sides so you can lift the whole block out later.

Melt and stir:

In a medium saucepan over low heat, melt the peanut butter and butter together, stirring gently until the mixture looks glossy and smooth.

Add the sweet stuff:

Take the pan off the heat and stir in the powdered sugar and vanilla, mixing until no white streaks remain.

Fold in marshmallows:

Let the mixture sit for two to three minutes so it cools slightly, then gently fold in the marshmallows until every one is coated but still holds its shape.

Press and top:

Pour everything into your prepared pan, press it out evenly, and scatter chocolate chips on top if you are using them, pressing lightly so they stick.

Chill and slice:

Refrigerate for at least one hour until firm, then lift the block out and cut it into sixteen squares with a sharp knife.

Save

I brought a plate of these to a potluck and watched a friend who usually skips dessert come back for seconds without saying a word.

Swaps and Variations

Sunflower seed butter works beautifully if peanuts are off the table, and the flavor stays rich and earthy in a way that surprises people.

Storage and Make Ahead

These squares hold their shape best when kept chilled, and they will stay fresh in an airtight container in the refrigerator for up to one week.

Finishing Touches

A sprinkle of chopped roasted peanuts or flaky sea salt on top right before chilling adds texture and a hint of saltiness that balances the sweetness perfectly.

• Use a hot dry knife for cleaner cuts through the sticky layers.
• Let them sit at room temperature for five minutes before slicing so the marshmallows do not tear.
• Always double check every ingredient label, even vanilla extract, to keep this truly gluten free.

Save

Keep a batch in the fridge and you will always have something sweet to offer unexpected guests, no baking required.

Recipe FAQs

→ Are mini marshmallows safe for gluten-free diets?

Many mini marshmallows are gluten-free, but manufacturers vary. Always check the package for a gluten-free certification or ingredient statement to avoid cross-contamination risks.

→ How do I prevent marshmallows from melting when mixing?

Let the warm peanut butter mixture cool for 2–3 minutes before folding in marshmallows, and fold gently to coat them rather than stirring vigorously so they keep their shape.

→ What type of peanut butter yields the best texture?

Use creamy, well-stirred peanut butter for a smooth, cohesive base. Natural peanut butter can work but may need extra stirring; avoid overly oily separations for easier mixing and pressing.

→ How should I store these bars for best texture?

Keep them refrigerated in an airtight container for up to 5 days to maintain firm, chewy texture. For longer storage, freeze individually wrapped squares for up to 1 month and thaw in the fridge.

→ Can I make a peanut-free version?

Yes—substitute sunflower seed butter or another nut-free spread in equal measure. Expect a slightly different flavor and color but a similar texture when chilled fully.

→ Any tips for cutting clean squares?

Chill the pan until very firm, then use a sharp knife warmed in hot water and wiped dry between cuts. This helps produce neat edges without dragging marshmallow strands.