Доброе утро! (Dobroe utro!)
Here's how to pronounce it:
* Доброе (Dobroe) - Sounds like "DOH-bruh-yeh"
* утро (utro) - Sounds like "OO-troh"
You can also say "good morning" in a more formal way by adding "Вас" (Vas) or "Вам" (Vam) before "доброе утро", which means "you" in the formal sense.
* Вас доброе утро! (Vas Dobroe utro!) - "Good morning to you!" (formal)
* Вам доброе утро! (Vam Dobroe utro!) - "Good morning to you!" (formal)
The choice between these options depends on the context and your relationship with the person you are talking to.