Peach-Blackberry Crisp

Ingredients

• 2 teaspoons unsalted butter
• One 1-pound bag (4 cups) frozen peaches
• One 1-pound bag (3 cups) frozen blackberries
• 1/2 cup sugar
• 3 tablespoons all-purpose flour
• 1 teaspoon vanilla extract
• Crisp Topping (recipe follows)
• Whipped cream, crème fraîche, or
• vanilla ice cream, for serving (optional)
• Crisp Topping
• 6 tablespoons (3/4 stick) cold unsalted butter, cut into small pieces
• 2/3 cup all-purpose flour
• 2/3 cup old-fashioned rolled oats
• 1/2 cup packed light brown sugar
• 1/4 cup packed dark brown sugar
• 1 teaspoon ground cinnamon
• 1/2 teaspoon finely grated nutmeg
• 1/4 teaspoon salt