Peach and Blackberry Tart with Oatmeal-Cookie Crust

Crust

• Nonstick vegetable oil spray
• 2 cups oatmeal-cookie crumbs (made from about 32 crispy oatmeal cookies)
• 5 tablespoons unsalted butter, melted

Filling

• 2/3 cup peach or apricot nectar
• 5 tablespoons sugar
• 5 teaspoons cornstarch
• 2 2/3 cups coarsely chopped peeled peaches
• 1 1/4 teaspoons fresh lemon juice
• 1 1/4 cups large blackberries