In a small bowl, mix together turkey, sesame oil, garlic powder and cayenne pepper. Coat well and set aside.
Place fresh green beans and water in a microwave-safe dish. Cook on high for 30 seconds. Remove and drain water. (Skip this step is using frozen green beans.)
Meanwhile, prepare instant brown rice according to package instructions.
Heat a large nonstick frying pan (or wok) over medium heat and add canola oil. Add turkey mixture and cook, stirring frequently with a wooden spoon for 5 minutes. Add peanuts and stir-fry for 30 seconds. Next, add the green beans and stir-fry for 1 more minute. Pour chicken broth and soy sauce and cook until liquid evaporates, about 5 minutes. Divide rice among 4 plates and top rice with turkey-peanut mixture.