Blueberry crumble bars are a perfect balance of tart, juicy berries and a sweet, crumbly crust that holds together beautifully without the need for butter. This recipe swaps out butter for coconut oil, making it a great option for those avoiding dairy or looking for a lighter alternative, while still delivering that classic crumbly texture and rich flavor.
Ingredients
- 1 ½ cups all-purpose flour
- ¾ cup rolled oats
- ½ cup granulated sugar
- ¼ teaspoon salt
- ½ teaspoon baking powder
- ½ cup coconut oil, solid but scoopable (not melted)
- 1 large egg
- 1 teaspoon vanilla extract
- 2 cups fresh or frozen blueberries (if frozen, thaw and drain excess liquid)
- ½ cup granulated sugar (for filling)
- 2 tablespoons cornstarch
- 1 tablespoon lemon juice
- 1 teaspoon lemon zest (optional, for brightness)
- Pinch of salt (for filling)
Instructions
- Preheat your oven to 350°F (175°C). Line an 8×8-inch baking pan with parchment paper, leaving some overhang for easy removal.
- In a large bowl, whisk together the flour, rolled oats, sugar, salt, and baking powder.
- Add the solid coconut oil to the dry ingredients. Using a pastry cutter or your fingers, work the coconut oil into the flour mixture until it resembles coarse crumbs with some pea-sized pieces remaining.
- In a small bowl, beat the egg with vanilla extract. Add this to the crumb mixture and stir gently until combined. The dough will be slightly sticky but should hold together when pressed.
- Reserve about 1 ½ cups of the crumb mixture for the topping. Press the remaining dough evenly into the bottom of the prepared pan to form the crust.
- In another bowl, combine the blueberries, sugar, cornstarch, lemon juice, lemon zest (if using), and a pinch of salt. Toss gently to coat the berries evenly.
- Spread the blueberry filling evenly over the crust layer.
- Crumble the reserved topping evenly over the blueberry layer, pressing lightly to help it adhere but not compacting it too much.
- Bake for 40–45 minutes, or until the topping is golden brown and the filling is bubbling.
- Remove from the oven and cool completely in the pan on a wire rack. Once cooled, use the parchment paper overhang to lift the bars out. Cut into squares and serve.
Tips
- Coconut oil consistency: Use solid coconut oil, not melted, to achieve a crumbly texture similar to butter. If coconut oil is too soft, chill it briefly before mixing.
- Oats substitution: Rolled oats add texture and nutty flavor, but you can substitute quick oats if needed. Avoid instant oats as they may make the crust too soft.
- Frozen blueberries: If using frozen berries, thaw and drain well to prevent the filling from becoming too watery and soggy.
- Storage: Store bars in an airtight container at room temperature for up to 2 days or refrigerate for up to 5 days to keep them fresh.
Serving Suggestions
Blueberry crumble bars are delicious on their own or served slightly warmed with a scoop of vanilla ice cream or a dollop of whipped coconut cream for a dairy-free option. They also pair well with a hot cup of tea or coffee, making them a great choice for brunch or afternoon snacks. For a festive touch, dust with powdered sugar just before serving.
Variations
- Fruit swaps: Substitute blueberries with raspberries, blackberries, or a mixed berry medley for different flavor profiles.
- Nutty crumble: Add ¼ cup chopped walnuts or pecans to the crumble topping for extra crunch and flavor.
- Gluten-free option: Use a gluten-free all-purpose flour blend and certified gluten-free oats to make this recipe gluten-free.
- Sweetener alternatives: Replace granulated sugar with coconut sugar or maple syrup (reduce liquid slightly) for a more natural sweetness.
Storage and Reheating
Store blueberry crumble bars in an airtight container at room temperature for up to 2 days. For longer storage, refrigerate for up to 5 days. If you want to freeze them, wrap individual bars tightly in plastic wrap and place them in a freezer-safe container or bag; they will keep well for up to 3 months.
To reheat, warm bars in a preheated 350°F (175°C) oven for 8–10 minutes or until heated through. You can also microwave a single bar for 20–30 seconds, but the crust may lose some crispness.
Frequently Asked Questions
Can I use margarine or oil instead of coconut oil?
Yes, margarine can be a substitute, but make sure it is solid and cold for the best crumbly texture. Vegetable oil is not recommended as it will make the crust too wet and greasy, losing the crumble consistency.
What if I don’t have cornstarch for the filling?
Cornstarch helps thicken the blueberry juices during baking. You can substitute with arrowroot powder or tapioca starch in equal amounts. If unavailable, reduce the sugar slightly and bake until the filling thickens, but expect a looser filling.
How do I prevent the crumble topping from becoming soggy?
Ensure the blueberries are well coated with cornstarch and drained if frozen. Press the crumble topping lightly but don’t compact it too much, allowing steam to escape and the topping to crisp up.
Can I make these bars vegan?
To make vegan bars, replace the egg with a flax egg (1 tablespoon ground flaxseed mixed with 3 tablespoons water) and use maple syrup or another vegan sweetener instead of granulated sugar if desired. Coconut oil is already vegan-friendly.
Why is my crust not holding together?
This can happen if the coconut oil is too soft or melted when mixed, or if the dough is overmixed. Use solid coconut oil and mix just until combined. Press the crust firmly into the pan before adding the filling to help it hold shape.
Can I use frozen blueberries straight from the freezer?
It’s best to thaw frozen blueberries and drain any excess liquid before using to prevent a watery filling. If you use them frozen, the bars may take longer to bake and could be soggier.
With these tips and variations, this blueberry crumble bars recipe without butter is a versatile, crowd-pleasing treat that’s easy to adapt to your preferences and dietary needs. Enjoy the perfect balance of juicy berries and crumbly topping every time!
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