6 cups blueberries, rinsed and lightly dried
1 tablespoon cornstarch
1/4 cup sugar
Pinch salt
1/2 cup all-purpose flour
1/2 cup quick-cooking oats
1/4 cup packed light brown sugar
1/4 cup sugar
1/4 teaspoon ground cinnamon
1/4 teaspoon ground nutmeg
3/4 cup chopped pecans
1/2 stick room temperature unsalted butter, cubed
Whipped cream, for topping
Ice cream, for topping