Serves about six
4 cups fresh blueberries
juice of one lemon
3/4 cup brown sugar
1/2 cup flour
1/2 tsp cinnamon
1/2 stick cold butter, cut into tiny pieces
3/4 cup old fashioned oats
Preheat the oven to 375 and spray a shallow pan (I used a 9 by 15? pan) with cooking spray. Spread out the berries evenly along the bottom of the pan and sprinkle the lemon juice on top.
In a large bowl, combine all the rest of the ingredients and use your hands to work in the butter. In the end, you should have tiny pieces of butter throughout. You still want some chunks for optimal streusel.
Spread the streusel on top of the blueberries and bake for about 25 minutes. Serve warm with vanilla ice cream or fresh whipped cream.