2cupsfresh or frozen strawberrieshulled and halved if large
2cupsfresh or frozen blueberries
2cupsfresh or frozen raspberries
3tablespoonspure maple syrupor honey
2tablespoonscornstarchadd 1 extra tablespoon if using frozen berries
1tablespoonfresh lemon juice
1teaspoonlemon zest
1teaspoonpure vanilla extract
1/2teaspoonground cinnamon
1.5cupsold-fashioned rolled oatsuse certified GF oats for gluten-free
1/2cupall-purpose flouror almond flour for gluten-free
1/3cupbrown sugarpacked, or coconut sugar
3tablespoonspure maple syrup
1/2teaspoonground cinnamon
1/4teaspoonfine sea salt
6tablespoonsunsalted buttercold, cut into small cubes (or coconut oil for dairy-free)
1/2cupchopped pecans or walnutsoptional but highly recommended
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Instructions
Preheat your oven to 350°F (175°C). Lightly grease a 9x9-inch or similar 2-quart baking dish with butter or cooking spray.
If using frozen berries, do not thaw. If using fresh berries, rinse gently and pat dry. Hull and halve strawberries if they are large.
In a large bowl, combine the strawberries, blueberries, and raspberries. Add the maple syrup, cornstarch, lemon juice, lemon zest, vanilla extract, and cinnamon.
Toss gently until all the berries are evenly coated and the cornstarch is fully incorporated. Pour the berry mixture into the prepared baking dish and spread into an even layer.
In a medium bowl, whisk together the rolled oats, flour, brown sugar, cinnamon, and salt.
Add the maple syrup and cold cubed butter. Using your fingertips, work the butter into the oat mixture by pressing and rubbing until the mixture resembles coarse crumbs with some pea-sized clumps of butter remaining. Do not overwork — those butter pieces are what create the crispy clusters.
If using nuts, fold them in now.
Scatter the oat crumble topping evenly over the berry filling. Do not press it down — you want a loose, textured surface for maximum crunch.
Bake for 38–42 minutes, until the topping is deep golden brown and the berry filling is bubbling around the edges. If using frozen berries, add 10 additional minutes.
Remove from the oven and let rest for at least 10 minutes before serving. This allows the filling to thicken slightly. Serve warm with vanilla ice cream, Greek yogurt, or whipped cream.
Notes
Storage: Cover and refrigerate for up to 4 days. Reheat in a 350°F oven for 10–15 minutes to restore crunch. Freeze baked crisp for up to 3 months. Gluten-Free: Use certified GF rolled oats and substitute almond flour or oat flour for the all-purpose flour. Dairy-Free: Replace butter with cold solid coconut oil, cut into cubes. Pro Tip: For extra nutty depth, toast the rolled oats on a dry baking sheet at 350°F for 8–10 minutes before mixing into the crumble.