Preheat the oven to 350 degrees F. Line a baking sheet with parchment paper. Set 8, 1-cup baking cups or ramekins on the baking sheet. Combine filling ingredients in a bowl. Divide and spoon the filling into the dishes, ensuring each cup gets some of the juice from the mixture.
Place topping ingredients in a second bowl and work until well combined. Sprinkle topping over the filling. Bake the crumbles 40 minutes, or until golden brown and bubbly. Serve warm or at room temperature. Top crumbles, if desired, with ice cream, or whipped cream.
Recipe Options: Instead of just blueberries, use a 2 1/2 cup mix of berries in the crumbles, such as blueberries, blackberries and raspberries. If this recipe yields too many crumbles for you, you could wrap and freeze the ones you don't need, unbaked. When needed, thaw the crumbles and then bake as described in the recipe.