INGREDIENTS
4
cups fresh blueberries
1/2 cup
granulated sugar
2 tbsp
lemon juice
2 tbsp
cornstarch
6
tablespoons unsalted butter, cold (3/4 of 1 stick)
1/2 cup
brown sugar
1/2 cup
old-fashioned whole-rolled oats (not quick cook or instant)
1/2 cup
all-purpose flour
1/4 tsp
salt, or to taste
whipped cream, whipped topping, or ice cream, optional for serving