Crockpot Blueberry Butter

Crockpot blueberry butter is a thick, smooth, jammy fruit spread that practically makes itself. Fresh or frozen blueberries cook down slowly in the slow cooker with sugar, lemon juice, vanilla, cinnamon and a touch of ginger, then get blended smooth and cooked uncovered until rich and spreadable. It tastes like blueberry pie filling in a jar, with no pectin and no stirring over a hot stove. If you love fruit butters, also try this slow cooker apple butter and this salted caramel apple butter.

Why You’ll Love This Crockpot Blueberry Butter

• Hands-off: the slow cooker does almost all of the work.
• Only 7 ingredients: simple pantry staples plus blueberries.
• Works with frozen berries: make it any time of year.
• No pectin needed: it thickens naturally as it cooks uncovered.
• Warmly spiced: vanilla, cinnamon and ginger give it a cozy, bakery-style flavor.

Ingredients for Crockpot Blueberry Butter

For the blueberry butter

• 6 cups fresh or frozen blueberries
• 3/4 cup sugar
• 2 tablespoons lemon juice
• 1 teaspoon vanilla extract
• 1 teaspoon ground cinnamon
• 1/4 teaspoon ground ginger
• Pinch of salt

Optional extras

• 1 teaspoon finely grated lemon zest for extra brightness (optional)
• A pinch of ground nutmeg or cardamom (optional)
• 1 to 2 tablespoons maple syrup in place of some of the sugar (optional)

Ingredient Notes

• Blueberries: fresh and frozen both work. There is no need to thaw frozen berries, but they release more juice, so they may need a little longer to thicken.
• Sugar: regular white sugar keeps the flavor clean and fruity. Taste after blending and add a spoonful more if your berries are tart.
• Lemon juice: it brightens the flavor and balances the sweetness. Bottled or fresh both work.
• Spices: cinnamon and ginger are gentle here. Add more after blending if you like a spicier spread.
• Salt: just a pinch makes the berry flavor taste fuller.

How to Make Crockpot Blueberry Butter

1. Add everything to the slow cooker: place the blueberries, sugar, lemon juice, vanilla, cinnamon, ginger and salt in the slow cooker and stir well.
2. Cook covered: cover and cook on low for about 4 hours, or on high for about 2 hours, until the berries have burst and released their juices.
3. Blend smooth: use an immersion blender to puree the mixture right in the slow cooker. You can also blend it carefully in batches in a blender, venting the lid so hot steam can escape, then return it to the slow cooker.
4. Cook uncovered to thicken: leave the lid off, or set it slightly ajar, and cook on high for 1 to 2 hours more, stirring every 30 minutes, until thick and spreadable.
5. Test the thickness: spoon a little onto a cold plate. It is ready when it holds its shape and no ring of liquid separates around it.
6. Cool and store: let it cool, then spoon it into clean jars or containers, cover and refrigerate.

Hands-on time is about 15 minutes, with roughly 5 to 6 hours of slow cooking in total. The recipe makes about 3 cups.

Tips for the Best Crockpot Blueberry Butter

• Be patient with the uncovered step: this is where the butter gets its thick texture, so do not rush it.
• Stir the edges: the spread thickens fastest along the sides, so scrape them down as you stir.
• Remember it thickens as it cools: stop when it is slightly looser than you want.
• Prop the lid: a wooden spoon laid across the top lets moisture escape while limiting splatters.
• Handle it safely: use clean jars and utensils, and cool and refrigerate it promptly, following the FDA safe food handling basics.

Serving Ideas

Spread blueberry butter on toast, biscuits, scones or warm muffins, swirl it into yogurt or oatmeal, or spoon it over pancakes and waffles. It is also delicious tucked into these blueberry breakfast quesadillas. For more homemade spreads, try this French-style blackberry vanilla jam or a festive merry Christmas jam.

Variations

• Blueberry lemon butter: add the zest of one lemon after blending.
• Mixed berry butter: swap 2 cups of the blueberries for blackberries or raspberries.
• Chunky style: blend only half of the mixture for a spread with whole berries.
• Extra spiced: add a pinch of nutmeg, cloves or cardamom.
• Less sweet: start with 1/2 cup sugar and add more to taste after blending.

Storage

This blueberry butter is a refrigerator spread, not a shelf-stable canned product. Store it in clean, covered jars or containers in the refrigerator and use it within about 2 to 3 weeks. For longer storage, freeze it in freezer-safe containers with a little headspace for up to 6 months, then thaw it in the refrigerator. Do not store it at room temperature unless you process it with a tested home canning method. For more guidance, see the FDA advice on storing food safely.

FAQ

What is the difference between blueberry butter and blueberry jam?

Fruit butter is blended smooth and cooked down slowly until thick, without added pectin. Jam usually has pieces of fruit and often relies on pectin to set.

Can I use frozen blueberries?

Yes. Add them straight from frozen. They release more liquid, so the uncovered cooking time may be a little longer.

Why is my blueberry butter runny?

It most likely needs more uncovered cooking time. Keep cooking with the lid off, stirring often, and remember it thickens more as it cools.

Can I can this blueberry butter?

This recipe is written as a refrigerator and freezer spread. If you want shelf-stable jars, follow a tested home canning recipe and method exactly.

Can I make it on the stovetop?

Yes. Simmer everything in a heavy pot over medium-low heat, blend, then keep simmering and stirring often until thick, about 45 minutes to 1 hour.