Preheat oven to 375 degrees. Coat fillets with olive oil and place skin-side down in large baking dish. Sprinkle fillets with five-spice powder, sugar, lime peel, lime juice, garlic powder, red pepper flakes, and salt and pepper.
Bake, uncovered, 15 minutes or until fish flakes easily with a fork.
Meanwhile, heat sesame oil in large nonstick skillet. Add mushrooms and ginger; cook and stir until mushrooms are soft. Stir in bok choy and cook until heated through. Serve salmon over mushroom-bok choy mixture.