Leftover Thanksgiving Stuffed Shells – Fustini's Oils & Vinegars

Ingredients

• 1 tablespoon Fustini's Tuscan Herb olive oil, plus more for the pan
• 2 tablespoons diced onion
• 2 tablespoons diced celery
• 1 cup shredded Italian cheese blend
• 1 cup turkey, diced
• 1 cup cooked stuffing
• 1/4 cup green onion, chopped
• 1 cup mashed potatoes
• 24 large pasta shells, cooked
• turkey gravy