🍫 Gooey Sourdough Discard S'mores Bars — Toasted Marshmallow, Melty Chocolate & Zero Campfire Required

🍫 Gooey Sourdough Discard S'mores Bars — Toasted Marshmallow, Melty Chocolate & Zero Campfire Required

All the gooey campfire magic, baked in one pan, no mosquito bites involved.

Makes 16 bars • Beginner Friendly • Discard-Powered • Ready in ~55 Minutes

Your sourdough discard has been sitting in the fridge, quietly judging you. You hate throwing it away, but you don't want another all-day project either. These sourdough discard s'mores bars are the answer: a buttery graham base, a thick layer of melty chocolate, and a golden toasted marshmallow top that stretches when you pull a bar apart.

No campfire. No special equipment. No waiting for dough to rise. Just one pan, about fifteen minutes of effort, and the oven does the rest.

Why You'll Love This S'mores Bars Recipe

• ✔ Uses a full cup of discard — real waste-busting, not a token spoonful
• ✔ One pan, minimal dishes, no mixer required
• ✔ That pull-apart marshmallow stretch everyone photographs
• ✔ Discard adds a subtle tang that balances the sweetness
• ✔ Ready in under an hour, even better the next day
• ✔ Scales easily for a crowd — double it and watch them vanish
• ✔ Beginner-proof: if you can stir and press, you can make these

Sourdough Discard S'mores Bars Ingredients

Graham Base

• 200 g graham cracker crumbs (about 14 full sheets, crushed fine)
• 100 g unsalted butter, melted (about 7 tablespoons)
• 50 g brown sugar, packed (about 1/4 cup)
• 240 g sourdough discard, unfed, at room temperature (about 1 cup)
• 5 g vanilla extract (about 1 teaspoon)
• 3 g fine sea salt (about 1/2 teaspoon)

Chocolate & Marshmallow Layers

• 340 g milk chocolate bars, broken into pieces (about 6 standard bars) or chocolate chips (about 2 cups)
• 280 g mini marshmallows (about 1 bag, 10 oz) or large marshmallows cut in half
• 60 g graham cracker pieces, for topping (about 4 sheets, broken rough)

🥣 Step 1: Prep the Pan & Crush the Crackers

Heat your oven to 350°F (175°C). Line an 8x8-inch pan with parchment, leaving overhang on two sides so you can lift the whole slab out later.

Crush the graham crackers into fine crumbs — a zip-top bag and a rolling pin work beautifully. You want crumbs, not dust, with a few bigger bits for texture. Beginner Tip: uneven crumbs are fine. Rustic beats perfect here.

🥣 Step 2: Mix the Discard Graham Base

Stir the graham crumbs, melted butter, brown sugar, and salt until the mixture looks like wet sand. Fold in the discard and vanilla — the discard binds the base, adds moisture, and brings a gentle tang that keeps these bars from tipping into sugar overload.

Press firmly and evenly into the lined pan, using the bottom of a measuring cup to compact it — a firmly packed base slices cleanly instead of crumbling. Pro-Level Move: press the base slightly up the sides to form a tiny lip that holds the chocolate in.

🥣 Step 3: Layer the Chocolate

Scatter the chocolate evenly over the base, right to the edges. Don't be shy — skimpy chocolate is the only real way to mess this up. Broken bar chunks melt into gloriously irregular pools.

Bake 8 minutes, just until the chocolate softens and goes glossy, then spread it into an even layer with the back of a spoon. Beginner Tip: a few solid chunks are fine — they'll finish melting under the marshmallows.

🥣 Step 4: Pile on the Marshmallows

Cover the chocolate completely with mini marshmallows, edge to edge, in a single snug layer. Gaps mean someone gets a bar with no marshmallow — a tragedy nobody deserves. Press them down lightly so they sit in the chocolate.

Scatter the rough graham pieces over the top for extra crunch. Pro-Level Move: tuck a few extra chocolate chunks between the marshmallows — they melt into little pockets of joy.

🥣 Step 5: Bake & Toast to Golden

Bake 18–22 minutes, until the marshmallows are puffed and golden and the edges are bubbling. Watch the last few minutes closely — marshmallows go from golden to burnt in about sixty seconds. If they're still pale at 20 minutes, broil 1–2 minutes, standing right there watching.

Cool in the pan for at least 30 minutes. Slicing hot means the chocolate runs everywhere and the bars collapse — patience is the difference between bars and a delicious puddle. Beginner Tip: chill the slab 20 minutes after cooling, then slice with a sharp knife wiped clean between cuts.

👩🍳 Squirrelly Girl Baker's Tips

1. 🥄 Room-temperature discard mixes smoother. Cold discard clumps — give it 30 minutes on the counter first.

2. 🍫 Milk chocolate melts best. Dark chocolate works, but milk chocolate gives the classic s'mores flavor and the gooiest melt.

3. 🔥 The broiler is your toasting shortcut. Just don't walk away — marshmallows burn while you're checking one text.

4. ✂️ Parchment overhang is non-negotiable. Lifting the whole slab out is how you get bakery-clean squares.

5. 🧊 A quick chill = perfect slices. Twenty minutes in the fridge firms the chocolate for sharp, clean cuts.

6. 🥜 Feeling wild? Add peanut butter. Swirl 60 g (about 1/4 cup) of creamy peanut butter into the warm chocolate layer before the marshmallows go on.

🧊 Make It Ahead

These bars keep in an airtight container at room temperature for up to 4 days — if they last that long. For longer storage, freeze sliced bars in a single layer, then stack with parchment between layers for up to 2 months. Thaw 30 minutes at room temperature, or warm a slice 10–15 seconds to bring back the gooey chocolate.

🚨 S'mores Bars Troubleshooting

My base crumbles when I slice it

It wasn't pressed firmly enough, or it was sliced too warm. Compact it well with a measuring cup, cool fully, and chill briefly before slicing.

My marshmallows burned

Marshmallows toast fast, especially under a broiler. Check every 30 seconds in the last few minutes and pull the pan when they're golden, not dark brown.

My chocolate layer is patchy

The chocolate didn't get long enough in the oven, or the pieces were too sparse. Give it the full 8 minutes and don't skimp on the chocolate.

My bars are too sweet

Swap half the milk chocolate for dark chocolate, or cut the base brown sugar to 25 g. The discard's tang already helps balance things.

My marshmallow top deflated

Totally normal — marshmallows puff in the oven and settle as they cool. The flavor is identical.

Can I use active starter instead of discard?

Yes — this is a no-rise bake, so discard or active starter both work. Save your active starter for bread, though; discard is the whole point.

⚠️ Baker's Warning

You're officially the person who brings the bars now. Every gathering, every potluck — people will ask for these by name. Your discard will never be safe again, and neither will your chocolate stash.

🐿️ Ready to Bake Better Sourdough?

If discard is all that stands between you and a tray of these bars, maybe it's time to get a starter of your own. Here's why bakers love ours:

• FREE Worldwide Shipping
• Easy to Activate — even if you've never kept a starter alive before
• 100% Activation Guarantee — if it doesn't wake up, we've got you

Grab your Squirrelly Girl sourdough starter flakes and start baking. If you're ever unsure whether your starter is ready, our Activation Guarantee page walks you through what to expect. Once you've got discard to spare, our fudgy sourdough discard brownies are the next bake to try.

❓ FAQ: Sourdough Discard S'mores Bars

Do sourdough discard s'mores bars taste sour?

No — the discard adds a subtle tang that balances the sweetness, not a sour flavor. Most people can't tell there's sourdough in them until you tell them.

Can I make these without a campfire?

That's the whole point. The oven toasts the marshmallows and melts the chocolate — full campfire experience, zero smoke, zero bugs, zero firewood.

Can I use large marshmallows instead of minis?

Absolutely. Cut large marshmallows in half and pack them cut-side down for an even gooier stretch.

How do I keep the marshmallow top from sticking to everything?

Cool the bars completely before stacking, put parchment between layers, and lightly oil the knife for slicing.

Can I double this recipe?

Yes — bake it in a 9x13-inch pan and add about 5 minutes to the bake time, watching the marshmallows at the end.

Do I need to feed my discard first?

No. Unfed discard brought to room temperature is perfect. That's the beauty of discard baking — the jar you were about to toss becomes dessert.

❤️ Happy Baking!

Go rescue that discard.

Make the bars.

Watch them disappear.

Try not to eat three standing at the counter.

Okay, eat three. We won't tell.

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