Rhubarb Berry Crisp

Ingredients (16)

• For the rhubarb berry filling:
• 2 cups chopped rhubarb
• 2 1/2 cups mixed frozen berries
• 1/2 cup granulated sugar
• 1 tablespoon orange zest
• 1 tablespoon fresh orange juice
• 1/2 teaspoon vanilla extract
• 1 tablespoon cornstarch
• For the crisp topping:
• 1 1/2 cups cup old-fashioned oats
• 1/2 cup white whole wheat flour
• 1/2 cup packed brown sugar
• 3/4 teaspoon ground cinnamon
• 1/4 teaspoon salt
• 6 tablespoons butter
• Ice cream or whipped cream for serving