Southern Jam Cake with Caramel Icing

Name: Southern Jam Cake with Caramel Icing
Prep time: 20 min
Cook time: 1 h
Total time: 1 h 20 min
Cuisine: American
Ingredients: No-Stick Cooking Spray; 3/4 cup Butter; 1 1/4 cups Sugar; 3 large eggs; 1 Smucker's® Seedless Blackberry Jam; 2 1/2 cups all-purpose flour; 1 teaspoon baking soda; 1 teaspoon Ground cinnamon; 1/2 teaspoon ground cloves; 1/2 teaspoon ground allspice; 1/2 teaspoon ground nutmeg; 1/2 teaspoon Salt; 1 cup buttermilk; 1 cup chopped walnuts or pecans; ICING; 1/4 cup Butter; 1/2 cup firmly packed brown sugar; 1/4 cup buttermilk; 1 3/4 cups Powdered sugar; 1 teaspoon vanilla extract