Blackberry Apple Crisp

Bahan-bahan (12 porsi)

• 10 ounces fresh blackberries
• 3 apples, sliced thin, about 3 cups worth
• ¾ cup light brown sugar
• ½ teaspoon ground cinnamon
• ¼ teaspoon ground nutmeg
• ½ teaspoon kosher salt
• 1 tablespoon cornstarch
• 1½ cups old-fashioned oats
• 1½ cups all-purpose flour*
• ⅔ cup light brown sugar
• 1 cup butter, melted
• 1½ cups brown rice flour