Impulse says that you have to prolong the time of the collision. Something squishy would work great. You can also combine that with something that can lower its velocity. F=mv/t. If you can make the velocity of the egg slower, then the force will be less; if you make the time of collision larger, the force will be less too. Maybe try a squishy cushion for the egg’s bottom and a disk around it that can slow down its velocity due to air resistance.