Preheat oven to 400°F and line a baking sheet with parchment paper.
Season the salmon fillets with salt and pepper and place them on a plate or in a large shallow bowl.
In a small bowl, whisk together the miso sauce ingredients. Pour the mixture over the salmon and gently massage the marinade all over the fish. Set aside and let marinade while the oven reaches temperature.
In a medium bowl, toss together the green beans with the olive oil, red-pepper flakes and sesame oil and season to taste with salt and pepper.
Lay salmon fillets on the sheet pan and spread green beans out surrounding the fillets.
Bake until the salmon is opaque and the green beans are cooked through, about 12 minutes.
Right before serving, sprinkle with cilantro and lime. Serve with cooked brown rice and enjoy!