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Bring a medium pot of salted water to a boil. Wash and dry produce.
Trim and slice mushrooms into ΒΌ-inch-thick pieces. (Skip if your mushrooms are pre-sliced!) Trim and thinly slice scallions, separating whites from greens.
Pat chicken dry with paper towels; season with salt and pepper. Heat a drizzle of oil in a large pan over medium-high heat. Add chicken or sausage and cook, stirring frequently, until browned and cooked through, 4-6 minutes. Turn off heat; transfer to a plate. Wipe out pan.