Pour oil in a jelly-roll pan. Place in the oven while oven is heating to 450 degrees. Beat the eggs with the salt until light. Blend the sugar with the flour. Add to the eggs and beat until batter is smooth. Stir in milk and mix thoroughly. Remove pan from the oven and pour in the batter. Bake for 15 minutes, or until puffy and brown. Immediately spread with the cream cheese and jam. Roll up jelly-roll fashion. Sprinkle with the powdered sugar. Serve immediately.