"Get it all nice and good and cracked. " She is just saying that she is going to thoroughly crack the egg. Saying two or more redundant phrases is something that Americans sometimes do...I guess it's a kind of idiom? I'm not sure. "Well and good", meaning "that's fine, BUT" Example: "That's all well and good, but I need someone here by 5 O'clock." Several exclamations of how good something is when it's not actually good. (sarcasm) Example: *something bad happens* "Great! Fantastic! Awesome! We're screwed." *something bad happens* "Awesome! Excellent! Super! That's just really fantastic!" "Nice and..." or "Good and..." mean "thoroughly" Examples: "I hope you're good and ready!" "The food is in the oven, it should still be nice and hot when we get home."

it sounds like there is something missing from the last sentence. I can't understand how someone could get an egg "all nice and good and cracked", under any circumstances. But as a guess...perhaps they mean cleaning the egg and cracking it?

Well, that sentence isn't the best English sentence to begin with, but it does make sense for the most part. When you cook with eggs, and you need the raw inside to make something, you have to "crack" it open, right? Then you pour the liquid part of the egg into your bowl, and throw the shell of the egg away. That sentence is just telling the person following the instructions to crack the egg open. Most of the sentence is what we call "colloquial" language. It is language that a native speaker would recognize, but it doesn't make strict grammatical sense.