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Adjust rack to top position and preheat oven to 450 degrees. Bring a large pot of salted water to a boil. Wash and dry produce.
Trim and halve zucchini lengthwise; cut crosswise into ½-inch-thick half-moons. Peel and mince or grate garlic. Trim and thinly slice scallions, separating whites from greens. Zest and quarter lemon.
Pat chicken dry with paper towels and season with salt and pepper. Heat a drizzle of oil in a large, preferably ovenproof, pan over medium-high heat. Add chicken or sausage; cook, stirring frequently, until cooked through, 4-6 minutes. Turn off heat; transfer to a plate. Wipe out pan.