Triple-Layer Tennessee Jam Cake Recipe - Food.com

Ingredients

• 1 (18 1/4 ounce) package spice cake mix
• 1 cup buttermilk
• 1/3 cup sweetened applesauce
• 1/3 cup vegetable oil
• 3 large eggs
• 1/4 teaspoon cinnamon
• 1 cup blackberry jam
• 1/2 cup butter or 1/2 cup margarine
• 1/2 cup light brown sugar, firmly packed
• 1/2 cup dark brown sugar, firmly packed
• 1/4 cup milk
• 2 cups powdered sugar, sifted
• 1 teaspoon vanilla extract