1. Beat eggs and sugar for at least three minutes on highest speed.
2. Add remaining ingredients, excluding the syrup, and mix.
3. Pour into 9 x 13-inch baking pan.
4. Drizzle some chocolate syrup or liquid marble on top of batter and swirl into batter with a fork, to create a marbleized effect.
5. Bake at 350 degrees Fahrenheit for 45 to 50 minutes.