Escarole has been proven to be brain booster as per The Journal of Nutrition.
A quick recipe would be to saute a bunch escarole with some onions, chick peas, orange craisins and combine with bow tie pasta.
You can also make a quick soup. Add a bunch/handful of escarole to 2 cups of chicken broth. You can add with some left over chicken slices or just have plain. Squeeze some lemon in the soup.