Variations:
"Morgen" - This is a more informal way to say good morning. It can be used between friends or family members.
"Einen schönen Morgen" - This is a more formal way to say good morning. It can be used in professional settings or when addressing someone you don't know well.
"Schönen guten Morgen" - This is a very polite way to say good morning. It is often used when greeting someone for the first time in the day.