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Bring a medium pot of salted water to a boil. Wash and dry produce.
Trim and quarter mushrooms (skip if your mushrooms are pre-sliced!). Trim and thinly slice scallions, separating whites from greens. Dice tomato.
Rinse shrimp* under cold water and pat dry with paper towels or open package of chicken* and drain off any excess liquid. Season all over with salt and pepper. Heat a large drizzle of oil in a large pan over medium-high heat. Add shrimp or chicken; cook, stirring occasionally, until cooked through, 4-6 minutes. Turn off heat; transfer to a plate and cover to keep warm. Wipe out pan.