Step 1 - Butternut Squash & Mushroom Chicken (or Turkey) Pot Pies: Add chicken, onion, mushrooms, and butternut squash, sautéing about 10 minutes (if using raw diced chicken) until the chicken is no longer pink. If using leftover pre-cooked chicken or turkey, sautée the mixture for about 3-5 minutes until the onions turn translucent, and the mushrooms begin to brown.