Select Sear/Sauté on the Ninja Foodi and set to MD:HI. Select start to allow the Ninja Foodi to preheat for 5 minutes
Add butter to the pot and allow it to melt. Add onion, garlic and if using fresh carrots the diced carrots. Sauté for about 3 minutes until softened.
Add chicken and broth to the pot. Close with the sealed pressure cooker lid and select Pressure, set to High for 5 minutes. Select Start. (If using frozen mixed vegetables add these here.)
When cooking is complete, quick release the pressure and remove the lid.
Select Sear/sauté and set to MD:HI. Select start to begin. Add all remaining ingredients except the pie crust to the pot. (If using leftover already cooked vegetables, add these here.) Whisk or stir in the flour well and cook for about 3 minutes until he sauce is thick and bubbling.
Lay the pie crust across the filling mix and fold edges in as necessary. Make a cut in the middle of the pie crust to allow for the steam to release.
Close the crisping lid and select Broil and set to 10 minutes. Select Start.
When cooking is complete remove the pot to aa heat-resistant surface and let sit about 10 minutes before serving.