In a large saucepan, saute onions and mushrooms in oil. Add the garlic; cook 1 minute longer. Stir in the shrimp, rosemary and lemon-pepper. Cook for 3-4 minutes or until vegetables are tender.
Stir in the broth, chicken, ramen noodles and contents of seasoning packet if desired. Bring to a boil. Reduce heat; cover and simmer for 6-8 minutes or until noodles are tender. Garnish with bacon if desired.