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Preheat the oven to 350 degrees Fahrenheit.
Or if using frozen, run the berries under warm water for about 1 minute in a strainer (they will still be frozen on the inside but starting to thaw). Then mix with the filling ingredients in a bowl, then pour the filling into a round 9-inch pie pan, 9 x 9 inch baking dish or 7 x 11 baking dish.
In a medium bowl, mix together the oats, flour, sugar, cinnamon, nuts and kosher salt. Cut the butter into small pieces and then use your hands to mix it into the oats until fully distributed and a crumbly dough forms. It may take a while so be patient; you can also use a pastry cutter if you prefer. (If using coconut oil, it can be room temperature; use the same method to add it.) Pour the crumble on top and smooth it into an even layer with your fingers.
Bake for 45 to 50 minutes until the top is evenly golden brown and the filling is bubbly (this will vary based on your oven and berries: it may be shorter or longer so keep an eye on it). Cool for 30 minutes to 1 hour, then serve warm. If desired, top with whipped cream and mint leaves. You can leave out your crisp on the counter for up to 1 day (covered, at night) so the crisp topping can stay crisp. After 1 day, refrigerate any leftovers. This crumble also freezes well for several months in a sealed container; reheat it in a 350 degree oven until bubbly and the topping is crisp.