Preheat oven to 325. Lightly grease a 13 X 9 pan. Beat the eggs in a mixing bowl until light-colored and thick. Add teh sugar, beating until glossy and thick. Add vanilla and butter, beating to combine. Stir in the flour and salt. Scrape down beater and sides of bowl to incorporate.
Set aside 1 1/2 cups batter. Stir together the coffee crystals and cream and add to the remaining batter. Spread the coffee batter into prepared pan. Spoon the reserved batter over and then run a knife through the two batter to marble them. Sprinkle with nuts.
Bake 20-25 minutes or until the center is set. Cool before cutting.