Blackberry Cake

Ingredients

• 1 box moist yellow cake mix
• 4 large eggs
• 1 (3 oz). box raspberry or blackberry jello
• ½ cup vegetable oil
• ½ cup water
• 2 ⁄3 can blackberry pie illing
• 1 (8 oz.) package cream cheese
• 1 stick butter
• 1 lb. box confectioners sugar
• 1 tsp. pure vanilla extract
• 1 (8 oz.) tub cool whip
• fresh blackberries, for garnish