Summer Blueberry Crumble | America's Test Kitchen

Ingredients

• 1/2 cup (3½ ounces/99 grams) granulated sugar
• 4 teaspoons cornstarch
• 1/4 teaspoon salt
• 25 ounces (709 grams/5 cups) fresh blueberries
• 2/3 cup (3⅓ ounces/94 grams) all-purpose flour
• 1/2 cup (1½ ounces/43 grams) old-fashioned oats
• 1/3 cup packed (2⅓ ounces/66 grams) light brown sugar
• 1/2 teaspoon ground cinnamon
• 6 tablespoons unsalted butter, cut into 6 pieces and chilled