Slow Cooker Chocolate Brownies with Hazelnuts

Set the slow cooker to Low. Twenty minutes of prep, two hours ten minutes of heat, then nearly an hour resting—brownies that actually set right instead of sliding off your plate.

Why You’ll Love These Slow Cooker Chocolate Brownies

Fudgy in the middle. Edges that don’t dry out. The slow cooker does most of the work while you’re doing literally anything else. Honey rounds out the chocolate instead of making it one-note sweet. Changes the whole thing. Hazelnuts are optional but don’t skip them. The crunch against the soft center works. Works cold straight from the fridge. Tastes better the next day, honestly. Almond flour keeps it dense without being heavy—texture is different than regular brownies. Better, depending on who you ask.

What You Need for Dark Chocolate Brownies with Hazelnuts

Bittersweet chocolate. Not milk. Not dark. Bittersweet. The sharp kind. About 130 grams chopped fine. Unsalted butter, 140 grams, cold, diced into small pieces. Temperature matters here—cold butter emulsifies better. Granulated sugar, 170 grams. Regular white sugar. Nothing fancy. Honey. Fifty milliliters. Not agave, not maple syrup. Actual honey. Softens the chocolate edge. Two eggs. Large. Room temperature works but not essential. Vanilla extract, 5 milliliters. Pure, not imitation. Salt. Just 1 milliliter. The amount feels tiny but it’s right. All-purpose flour and almond flour mixed—40 grams of regular, 35 grams of almond flour. The combination is the point. Toasted hazelnuts, 90 grams, rough chopped. Optional except it’s not. Get them. They’re the contrast that makes this work.

How to Make Slow Cooker Chocolate Brownies

Grease the inside of your slow cooker pot thoroughly. Cut a strip of parchment paper long enough to line the bottom with edges hanging out on both sides—you’ll use those to lift the whole thing out later. Press it down.

Combine the bittersweet chocolate and cold butter in a microwave-safe bowl. Heat in short bursts—thirty seconds, stir, thirty seconds again. Microwaves are uneven so watch it. You want melted and smooth, not scrambled. Cool it slightly. Not cold. Just not steaming.

While it’s still warm, whisk in the sugar and honey. Don’t wait until it’s totally cooled or the sugar won’t dissolve right. Add the eggs one at a time and whisk hard each time. This emulsifies the eggs into the chocolate instead of them floating around. Vanilla and salt go in next. Stir.

Sift the flours together in a separate bowl. Fold them into the chocolate mixture gently—overmixing makes it cakey and you don’t want that. A few streaks of flour are fine. Stop before it’s totally smooth.

Toss in the hazelnuts if you’re using them. Fold until they’re distributed but don’t go crazy. Pour everything into the lined slow cooker pot. Smooth the top with a spatula so it cooks evenly.

How to Get Fudgy Brownies with Honey and Almond Flour

Cover the slow cooker and set it to Low. The exact time is 2 hours 10 minutes but every slow cooker runs different—some hotter, some cooler. Watch it. You’re looking for edges that look set and firm, a center that still jiggles just slightly when you nudge it, and a glossy sheen on top. That glossy part matters. If it looks dry on top, it’s overdone.

When it looks right, turn it off and leave the cover on. Don’t open it. Let it sit there for 50 to 60 minutes while it cools. This is when the brownies actually set. They’re still cooking a tiny bit from residual heat and they’re firming up. This resting time is non-negotiable.

After the rest, grab those parchment edges and lift the whole thing straight out. If you want to slice them warm, use a serrated knife and wipe the blade between cuts. Clean slices come from a clean blade. If you can wait, chill them fully—they’ll cut cleaner and cleaner.

Slow Cooker Brownies Tips and Common Mistakes

The parchment lining makes everything easier. Don’t skip it.

Cold butter emulsifies faster. If you forgot to take it out earlier, dice it anyway—slower than it should be but still works.

Honey instead of just sugar changes the flavor profile. You get this deeper thing happening. Not honey flavor exactly. Just richer.

The slow cooker should be on Low. High heat makes the edges set too fast and the center stays raw. Low lets it cook gently all the way through.

If the center is still running after the rest, pop the whole pot back in for 10 to 15 minutes. Don’t panic. It happens.

If the brownies turned out drier than you wanted—maybe your slow cooker runs hot—reheat them gently next time or lower the cook time by 5 minutes and check early.

Hazelnuts are specifically good here. Almonds work. Walnuts work. But toasted hazelnuts have this flavor that pairs with bittersweet chocolate in a way that’s hard to explain.

Slow Cooker Chocolate Brownies with Hazelnuts

By Emma

Prep:

20 min

Cook:

2h 10min

Total:

2h 30min

Servings:

8 servings

Ingredients

• 130 g finely chopped bittersweet chocolate
• 140 g cold unsalted butter, diced
• 170 g granulated sugar
• 50 g honey
• 2 large eggs
• 5 ml pure vanilla extract
• 1 ml salt
• 40 g all-purpose flour
• 35 g almond flour
• 90 g toasted hazelnuts, roughly chopped, optional

Method

1. 1 First, grease slow cooker pot well. Lay a parchment strip across bottom, letting edges extend outside—makes lifting out easier.
2. 2 Melt chocolate and butter together. I prefer gentle microwave bursts; prevents burning. Stir till smooth, remove from heat, cool slightly.
3. 3 Whisk in sugar and honey while warm but not hot. Add eggs one at a time; whisk vigorously to emulsify. Follow with vanilla and salt.
4. 4 Sift flours together, fold gently to keep batter dense but moist.
5. 5 Toss in hazelnuts if using. I like the crunch contrast. Mix evenly.
6. 6 Pour batter into lined crock. Smooth surface with spatula. Cover securely.
7. 7 Cook on Low around 2 hours 10 minutes but watch closely—slow cookers vary wildly. Edges firm, center glossy, jiggles when nudged.
8. 8 Remove insert, let rest covered a solid 50–60 minutes. Brownies will set perfectly as they cool.
9. 9 Use parchment edges to lift brownies out. For cleaner cuts, chill fully or slice warm with serrated knife.
10. 10 If center runs too soft, pop back for 10–15 minutes. If overcooked, expect drier edges.
11. 11 Pairs well with espresso or a scoop of vanilla ice cream. Store leftovers airtight; reheat gently.

Nutritional information

Calories

320

Protein

5g

Carbs

28g

Fat

22g

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Frequently Asked Questions About Slow Cooker Chocolate Brownies

Can I use regular all-purpose flour instead of almond flour? Sure. Replace the 35 grams of almond flour with regular flour. Texture changes—gets denser, more cakey. Not worse. Different.

How do I know when they’re actually done? Edges are set and pull back slightly from the pot. Center jiggles when you nudge it. Glossy on top. Don’t pull it out when the center looks completely firm or they’re overcooked.

Do I have to use hazelnuts? No. Leave them out and it’s still good. Or use walnuts, pecans, almonds—whatever. Hazelnuts are just better here. That’s my opinion.

Can I make these in a regular oven? Yeah, probably. 325°F for maybe 25 to 30 minutes. But this recipe is built for the slow cooker. Different heat profile. Worth doing it the way it’s written.

How long do they keep? Airtight container, room temperature, a few days. Fridge, a week easy. They taste better cold anyway.

Can I use honey instead of the sugar? You’d need to rework the amounts and the texture changes. Just use honey as written—it’s not replacing the sugar, it’s in addition.

What if my slow cooker cooks hotter than most? Start checking at the 1 hour 50 minute mark. Every slow cooker is different. If it looks done early, pull it out. Better to undercook slightly than overcook.