1. Combine the flour, milk, egg whites, and margarine in a food processor or blender. Process until smooth. Refrigerate up to 8 hours. Stir or shake before using.
2. Heat a 5- or 6-inch nonstick crepe pan or small nonstick skillet over medium heat. Spray with nonstick pan spray.
3. Pour about 3 tablespoons of batter into the hot pan, tilting to spread the batter evenly. Cook until the bottom of the crepe is lightly browned; turn and cook 30 seconds more.
4. Remove each crepe to a sheet of wax paper and repeat the process until all the batter is used. You should have 12 crepes.
5. Preheat the oven to 350 degrees F. Prepare a 9x13-inch baking dish with nonstick pan spray.
6. For the filling, combine the cheese, sugar, and vanilla in a food processor or blender. Process until smooth.
7. Spoon 2 heaping tablespoons of filling down the center of each crepe. Roll up; place seam-side down in the baking dish. Cover with foil.
8. Bake the crepes for 15 to 18 minutes, or until heated through. Serve with warm jam.