Spray non-stick cooking spray (3-4 seconds) into large skillet. Preheat skillet on medium-high for 1-2 minutes. Add diced onion and celery. Sauté for 3 minutes then add shredded carrots. Stir to incorporate and continue sautéing for 1 minute.
Add frozen shrimp scampi. Stir to incorporate breaking up any shrimp that are frozen together. Sauté for 6-7 minutes or until shrimp are fully cooked. Add 3/4 cup hot water. Bring mixture up to a simmer. Remove from heat.
Add stuffing mix. Stir to incorporate. Cover with a tight fitting lid and set aside for 5 minutes. Fluff with a fork and serve.