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This Slow Cooker hot fudge is pure Magic — just four ingredients, melted low and slow into something glossy, rich, and dark enough to make any bowl of ice cream feel like a celebration. It’s the kind of sauce that gets passed down for a reason.
Why You’ll Love It
Only 4 ingredients — chocolate chips, Sweetened condensed milk, butter, and cream. That’s it.
Practically hands-off — the Slow Cooker does the work while your house smells incredible
Better than anything store-bought — silky, rich, and deeply chocolatey in a way no jarred sauce can match
Perfect for gifting — pour into small mason jars, add a ribbon, and you’ve got the most impressive homemade gift on the table
Keeps for two weeks — make a big batch and have hot fudge on demand all week
A Few Notes on the Ingredients
I use semi-sweet chocolate chips and I’ve always used Nestle, same as what was probably on that original index card. My neighbor Carol swears by Ghirardelli and I think she’s probably right that they’re better, but I can’t quite bring myself to change it. Some habits are just habits. The sweetened condensed milk is Eagle Brand, always — there’s no real reason for that except that it’s what I use and it’s what I use. The butter should be unsalted so you control the salt yourself; I actually add a small pinch of flaky salt at the end and I think it makes a real difference, though technically the original recipe didn’t include it. The heavy cream loosens everything up and gives it that pourable, glossy quality. Don’t skip it or try to use half-and-half — I’ve done that, it was fine but not the same.
Ingredients
2 cups semi-sweet chocolate chips (I use a little more than two cups, I’ll be honest)
1 can sweetened condensed milk, 14 ounces
½ cup unsalted butter, cut into cubes — I do this straight from the fridge
½ cup heavy cream
Optional: a small pinch of flaky salt, a splash of vanilla
Making It
Spray the inside of your slow cooker first. This is not optional — I skipped it once and spent forty-five minutes cleaning baked-on chocolate off the edges and I will not do that again. A light coat of cooking spray and you’re fine.
Everything goes in at once. Chips, condensed milk, butter, cream. There’s no particular technique here, no melting things separately or tempering chocolate or anything like that — that’s the whole point. You just pile it all in, put the lid on, and cook on LOW.
The first hour you can more or less leave it alone. Around the hour mark, start checking on it and stirring every twenty or thirty minutes. Make sure you’re getting the edges — the edges are where things can start to stick if you’re not careful, and scorched chocolate is not something you can come back from. By about an hour and a half to two hours it should be completely smooth and glossy. It’ll be thick but still pourable. When you drag a spoon through it and it falls in a slow ribbon, you’re there.
This is when I add the salt and a tiny splash of vanilla. A tiny splash. I once got heavy-handed with the vanilla and it tasted like a candle — not in a good way. Stir it in, taste it, adjust. Then switch the slow cooker to WARM while you get your jars ready.
I use small mason jars — the 8-ounce ones — and I set them on a folded dish towel on the counter before I start ladling so I’m not burning myself trying to hold a hot jar. Pour carefully. Leave about half an inch at the top. Wipe the rims with a damp cloth before you put the lids on. Then just let them sit there on the counter until they’re completely cool. I know it’s hard. I know you want to put a spoon in. You can put a spoon in, but give it time to thicken first — it gets significantly better as it cools down.
Once they’re at room temperature, into the fridge they go. The fudge will thicken quite a bit overnight. To reheat, I do twenty-second bursts in the microwave, stirring between each one, until it’s pourable again. You can also set the jar in a bowl of warm water, which takes longer but doesn’t risk overheating the edges.
Variations
A version made with half milk chocolate chips comes out sweeter and softer — more like a milk chocolate ganache than a traditional hot fudge. Kids love it. I’ve made a version with all dark chocolate that’s really quite intense, almost bitter, and you need good vanilla ice cream to balance it. Around the holidays I sometimes add a few drops of peppermint extract and it turns into something entirely different, very festive, very good over brownies. I tried a mocha version once — stirred in a teaspoon of instant espresso powder — and it was fine but not something I’ve gone back to. The plain version is still the best.
If you’re giving jars away, make a double batch. It takes the same amount of effort and people are genuinely, disproportionately happy to receive homemade fudge. I’ve given it to teachers, to neighbors, to the woman who watches my cats when I travel. Everyone acts like you’ve done something extraordinary. You’ve used four ingredients and a slow cooker, but let them think what they want.
Storage
Refrigerator, up to two weeks. Freezer for longer, though leave some headspace in the jar — it expands. Thaw in the fridge overnight and then reheat gently. I’ve kept jars in the freezer for three months and they were perfectly fine. Maybe four months. I don’t actually remember; I lost track.