This apple blackberry crumble combines tart Granny Smith apples and juicy blackberries under a buttery oat topping that bakes until golden and bubbling. Sweet, tart and jammy all at once, it comes together in one bowl and is best served warm with a scoop of ice cream.
Pairing a crisp fall apple with a summer berry is one of my favorite dessert tricks. The contrast of textures and flavors makes for an instant crowd-pleaser. In this version, blackberries bring a deeper, slightly tart, jammy flavor that balances the firm, tangy apples. After your first spoonful you’ll understand why the combination is so satisfying.
This recipe is forgiving: use fresh blackberries in season or frozen berries any time of year. The crumble-style topping with oats creates a pleasant chew alongside a buttery crunch, and the filling finishes shiny and spoonable thanks to a touch of cornstarch.
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Why You Will Love This Apple Blackberry Tart
- Sweet, tart and jammy —Firm apples, jammy blackberries and a sweet oat topping hit every note together.
- Easy one-bowl prep —Toss the fruit, stir the topping, bake. No rolling pastry or special equipment required.
- Works year-round —Apples give it fall character; frozen berries keep it an anytime dessert. Serve warm or enjoy leftovers chilled.
What is the Difference Between a Crumble and a Crisp?
Crumble and crisp are similar: both are baked fruit topped with a streusel-like mixture of flour, sugar and butter and lack a pastry crust. The usual distinction is oats — a crisp contains oats, while a British-style crumble may not. Terminology varies by region, so the two names are often used interchangeably. This recipe uses oats for extra texture, giving you the best of both worlds: a crumble-style dessert with the chew of a crisp topping.
Ingredient Notes
- Granny Smith apples —Firm and tart, they hold their shape while baking and balance the sweet topping. Peel, core and slice about 1/2 inch thick. If you prefer sweeter fruit, Honeycrisp or Braeburn are good alternatives.
- Blackberries —The defining ingredient here. They break down into a deep, jammy filling with a pleasant tang. Use fresh in summer or add frozen straight from the freezer in colder months; avoid thawing first so they don’t release excess juice.
- Old-fashioned oats —Rolled oats give the topping a chewy-crisp texture. Quick oats cook too fast and become mushy, so don’t substitute them.
- Cornstarch —Essential for a glossy, spoonable filling. Blackberries are juicy, so a proper coating of cornstarch prevents a watery bottom.
- Brown sugar —Light brown sugar adds sweetness and a hint of molasses that enhances the fruit and helps the topping caramelize.
These core ingredients are what make the crumble shine—see the full recipe card below for exact amounts.
Ingredient Swaps
Swap ingredients easily to suit taste or pantry supplies:
- Blackberries → blueberries, raspberries, or a mixed-berry blend.
- Apples → pears for a softer, sweeter filling.
- Add ½ cup chopped pecans or walnuts to the topping for extra crunch.
- Spice it up with a pinch of nutmeg, ground ginger, or cardamom alongside the cinnamon.
- Make it gluten-free with a 1:1 gluten-free flour blend and certified gluten-free oats.
How to Make Apple Blackberry Crumble
Full ingredient list and step-by-step instructions are in the recipe card below.
Step 1: Preheat the oven to 375°F (190°C). For the topping, stir together the flour, oats and brown sugar in a bowl, then add melted butter and mix until the mixture resembles coarse crumbs.
Step 2: For the filling, whisk brown sugar, cornstarch, cinnamon and salt in a large bowl.
Step 3: Add the apples, blackberries, melted butter, lemon juice and vanilla. Toss until the fruit is evenly coated with the sugar-starch mixture.
Step 4: Spread the filling into a 2½‑quart baking dish or a 10‑inch cast iron skillet and scatter the topping evenly over the fruit.
Tip: Make sure the cornstarch fully coats the fruit. That even coating is what thickens the juices and prevents a watery bottom—especially important with juicy blackberries.
Step 5: Bake for 35–40 minutes, until the topping is golden and the fruit is bubbling at the edges. Let rest 10 minutes before serving so the filling sets slightly and scoops cleanly.
Tip: The crumble is done when the juices bubble up around the edges. That bubbling indicates the starch has activated and the filling will thicken as it cools.
Apple Blackberry Crumble FAQs
For the best texture, peel them. Peeled apples soften evenly and blend into the jammy filling; skins can become chewy. If you prefer a rustic texture and extra fiber, leave the skins on but slice the apples thinner so the skins are less noticeable.
Yes. Add frozen berries straight from the freezer so they keep some structure and don’t turn to mush. Add a couple of extra minutes to the baking time if needed. Thawed berries often release too much liquid.
Firm, tart baking apples like Granny Smith are ideal because they keep their shape and offset the sweet topping. Honeycrisp, Braeburn or Jonagold are also good. Avoid soft dessert apples that become mealy when baked.
Most often it’s not enough thickener or insufficient baking time. Make sure the cornstarch fully coats the fruit and bake until the juices bubble at the edges. Letting it rest for 10 minutes helps it set.
Yes. Assemble it unbaked and refrigerate overnight, then bake when ready. Baked crumble keeps up to 3 days refrigerated; reheat at 350°F to revive the topping. It also freezes well for up to 3 months.
Pro Tips / Recipe Notes
- Use old-fashioned oats —They retain pleasing chew and crunch; quick oats become mushy.
- Coat the fruit fully with cornstarch —This prevents a watery filling from the juicy blackberries.
- Bake until it bubbles —Golden color on top is nice, but bubbling fruit at the edges means the filling will set.
- Rest 10 minutes —It firms up as it cools and serves more cleanly.
- Serve warm with ice cream —A scoop of vanilla contrasts perfectly with the warm jammy fruit.
Other Recommended Fruit Desserts
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Apple Pie with Crumb Topping
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Strawberry Blackberry Pie
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Jam Bars with Crumble Topping
-
Cherry Crumble Pie
If you’ve tried this apple blackberry crumble or any recipe on Chisel & Fork, please let me know how it turned out in the comments below — I love hearing feedback.
Apple Blackberry Crumble
Ingredients
Crumb Topping
- ¾ cup all-purpose flour
- ¾ cup old-fashioned oats
- ⅔ cup light brown sugar
- 6 tablespoons unsalted butter, melted
Filling
- ½ cup light brown sugar
- 3 tablespoons cornstarch
- ½ teaspoon ground cinnamon
- ¼ teaspoon sea salt
- 3 cups Granny Smith apples, peeled, cored and cut into ½‑inch slices (3–4 apples)
- 3 cups blackberries
- 2 tablespoons unsalted butter, melted
- 2 teaspoons fresh lemon juice
- ½ teaspoon vanilla extract
Instructions
- Preheat oven to 375°F (191°C). In a medium bowl, combine the flour, oats and brown sugar for the topping. Stir in melted butter until the mixture resembles coarse crumbs.
- In a large bowl, whisk together the ½ cup light brown sugar, cornstarch, cinnamon and salt. Add the apples, blackberries, 2 tablespoons melted butter, lemon juice and vanilla. Toss until the fruit is evenly coated and no dry powder remains.
- Spread the filling evenly in an 8×12-inch baking dish or a 10-inch cast iron skillet. Sprinkle the crumb topping over the fruit.
- Bake for 35–40 minutes, or until the topping is golden and the filling is bubbling at the edges. Let cool 10 minutes before serving.
Notes
- Use old-fashioned rolled oats for texture; quick oats become gummy.
- Blackberries are juicy—ensure the cornstarch coats all the fruit to prevent a watery filling.
- Pull the crumble when juices bubble at the edges, not just when the top browns.
- Let it rest 10 minutes so the filling firms up and serves neatly.
- Leftovers keep up to 3 days in the fridge. Reheat at 350°F for a few minutes to re-crisp the topping.