Peanut Butter and Jelly Shortbread Wedges

Name: Peanut Butter and Jelly Shortbread Wedges
Yield: makes 14 to 16 Servings
Ingredients: Nonstick vegetable oil spray; 1/2 cup (1 stick) unsalted butter, room temperature; 1/4 cup creamy (smooth) natural peanut butter (made with only peanuts and salt)*; 1/2 cup sugar; Large pinch of salt; 1 teaspoon vanilla extract; 1 1/4 cups all purpose flour; 1/3 cup blackberry jam