Egg, Avocado, & Olive Oil Hair Mask: Avocado is rich in fatty acids making it very moisturizing for your hair. 2 egg yolks, 2 teaspoons of extra virgin olive oil, and half of a ripe avocado. Mash avocado and mix in egg yolks. Coat hair, cover with shower cap, and leave on for 20 minutes. Rinse with cool water and then proceed to shampoo and condition as usual.