Set aside 1 Tbsp. cream. Add remaining cream, reserved chicken, 10 oz. peas, and 1½ tsp. salt and bring to a simmer. Taste and adjust for seasoning. Cook, tossing occasionally, until warmed through, 3–4 minutes. Transfer skillet to a rimmed baking sheet, which will prevent any juices that bubble out of the pan from spilling onto your oven floor.