Add bacon and cook until crispy - if you are using pre-cooked bacon, skip this step.
If cooking bacon, remove and set onto a paper towel-lined plate to drain. If you did not cook the bacon in the pot, add a little bit of olive oil in the pot before cooking the vegetables.
Add onion, celery, garlic, and seasoning to the pot then cook for 3-5 minutes or until onions and celery are softened.
Add chicken broth to the pot and scrape down the sides and bottom to remove any bacon bits if needed.
Turn off the Ninja Foodi.
Stir in the cut potatoes.
Place the pressure cooker lid on the Ninja Foodi and seal it, then cook at high pressure for 8 minutes.
When the timer goes off, carefully quick release.
In a small bowl, whisk together the 2 tbsp of milk and cornstarch to make a slurry.
Remove the lid from the pot and set the Ninja Foodi to saute.
Pour in the remaining 1 cup of milk, cream, and the slurry.
Whisk this in to combine and let it come to a boil for about 5 minutes or until desired consistency is reached.
Turn off the Ninja Foodi and let cool for 5-10 minutes before serving.