In a wok or large skillet, heat 1 T. of the oil over medium-high heat for 1 minute, until hot. Add shrimp and half the garlic; cook and stir 3-5 minutes or until shrimp are pink. Transfer to a platter; set aside.
Add remaining 1 T. oil to wok; heat 1 minute or until hot. Add green beans and remaining garlic; cook and stir 3-5 minutes or until beans are crisp-tender.
Add coconut milk, lime juice, soy sauce and curry paste; stir until curry paste dissolves. Reduce heat to medium; add mushrooms and shrimp. Cook 2-4 minutes or until heated through. Spoon over cooked rice, if desired, and serve.