
We tried this Food Network recipe: https://www.foodnetwork.com/recipes/food-network-kitchen/blueberry-crumble-with-cornmeal-almond-topping-recipe-1973476 (Jan. 2014)
Note: If you use frozen blueberries, they elicit more liquid than fresh blueberries. So you may want to supplement frozen blueberries with additional flour to absorb that liquid.