When you fix eggs for your family, try breaking them toward the top of the egg. This will allow you more planting depth. Immediately wash and allow to dry.
When dry, take a nail or a screw and gently punch a small hole in the bottom of the egg for drainage. Place back in the container
Fill each egg shell up about 3/4 of the way with your potting mix. Press seeds in soil gently and cover with a little more potting soil. Seeds should only be covered about 1/4 inch.
Water gently and place in a sunny location in a window sill. Keep soil moist, but not soaked.