anais - from Toa baja, puerto rico
Yes, you can add things to yellow cake to enhance the flavor. Try 1/2 to 1 teaspoon of ground spices like cinnamon or nutmeg, 1 tablespoon of finely grated citrus peels, or 1 teaspoon of flavored extracts. Almond extract is very strongly flavored, so use only 1/2 teaspoon of that. Use your imagination and you'll come up with lots of new flavors from your standard mix!