This berry crumble comes together with simple, pantry-staple ingredients and only one bowl plus the baking dish. Nothing fussy, no special tools or techniques. Just a juicy, jammy fruit filling with a buttery, cinnamon-kissed crumb on top.
MAKE FILLING. In a large bowl, toss 6 cups berries with 1/3 cup granulated sugar, 2 tablespoons cornstarch, 2 teaspoons lemon juice, and 1/2 teaspoon Kosher salt until well coated. Spread in an even layer in a 9×9 baking dish or the larger from this set of two Staub baking dish set.
MAKE CRUMBLE. In a medium bowl, mix together 1 cup flour, 1/2 cup packed brown sugar, 1/3 cup granulated sugar, 1/2 teaspoon cinnamon, 1/2 teaspoon Kosher salt. Cut 1 stick (1/2 cup) cubed butter into the dry mixture with a fork or your fingers until pea-sized clumps form and the crumble holds together when squeezed.
TOP + BAKE. Sprinkle the crumble topping over the berries in an even layer. Bake for 35-40 minutes or until the crumble is deep golden brown and the filling is bubbling at the edges.
REST. Let cool on the counter for 5-10 minutes, so the filling can thicken up before serving.
SERVE. Serve warm with a scoop of vanilla ice cream.
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Don’t skip the cornstarch. Berries release way more juice than you’d expect once they hit the oven, and 2 tablespoons is what keeps you from ending up with a soupy filling instead of something you can actually scoop.
A mix of berries beats a single variety. Blueberries hold their shape and give you texture, while strawberries and raspberries break down and add natural sweetness and juiciness. Every berry plays a part!
Squeeze-test the crumble before it goes in the oven. If it doesn’t hold together in a clump when you squeeze a handful, your butter’s too warm. Pop the bowl in the freezer for 5 minutes before topping the berries.
Don’t pull it until you see bubbling around the edges. The crumble browns a bit before the filling has fully thickened. You want to see it actively bubbling at the edges, not just golden on top, or you’ll end up with a runny filling once it cools.
The 5-10 minute rest is key. Scooping it right away gives you a puddle instead of a jammy crumble. The cornstarch needs that resting time to finish thickening as it cools slightly.