Blackberry Crumble - The Village Grocer

Ingredients

• 3/4 cup all purpose flour
• 3/4 cup light brown sugar, firmly packed
• 1/2 teaspoon ground cinnamon
• 1/4 teaspoon kosher salt
• 1 cup large flake rolled oats
• 1/2 cup cold butter, unsalted, cut into 1/2 inch cubes
• 4 cups blackberries (2 pints)
• 1/4 cup white sugar
• 2 tablespoons cornstarch
• 1/2 teaspoon vanilla extract