Who knew a fish-and-veggie dinner could be so buttery and creamy?
Season fish. In skillet, heat oil over medium-high. Add fish. Cook until flaky, about 4 minutes per side. Transfer to plates. Wipe skillet clean. In skillet, cook sprouts and leek in butter over medium, stirring often, until softened, about 5 minutes. Add remaining ingredients. Cook, stirring often, until sauce thickens, about 4 minutes; season. Serve with fish.