01 - Preheat oven to 350°F. Lightly grease an 8x8 inch baking dish.
02 - In a large bowl, combine mixed berries, granulated sugar, cornstarch, vanilla extract, and lemon juice. Toss gently to coat evenly, then transfer to the prepared baking dish.
03 - In another bowl, combine flour, rolled oats, shredded coconut, brown sugar, and salt. Add the cold cubed butter and vanilla bean paste. Rub butter into dry ingredients with fingertips until mixture forms coarse crumbs.
04 - Sprinkle crumble mixture evenly over the berry layer in the baking dish.
05 - Bake for 35 minutes until topping is golden and berry juices are bubbling at the edges.
06 - Allow to cool for 10 minutes before serving. Serve warm, with vanilla ice cream or whipped cream if desired.