How to Boil an Egg Perfectly-How does an over-cooked egg with a rubbery white and a grey ring around the chalky yolk sound? Not good. But unfortunately that's how they are so often prepared. Here is the way to boil an egg perfectly: no breakage, a firm but tender white and a soft creamy yolk. I'll also give you tips to cater the cooking time for a boiled egg that’s cooked to YOUR perfection!