One 40x32 inch double diffused softbox, fabric at 18 inches.

The shadows are soft and vague. The large light source wraps light around the eggs and under the dish. The way it does that is because the 40 inch softbox (or umbrella) is 18 inches from the 7 inch dish (big and close), so light comes to the egg from the left and from the right, and from every which way, which fills its own shadow. This is how large light sources work, by being close in order to become relatively large. And large is what makes soft. The softness smooths skin, which is good for portraits.

There are reflections of the eggs on the dish, but notice the soft light also lightens the dark canyon between the eggs.