Dice the onions and celery. Peel and smash the garlic.
Cut the potatoes into 2-3" pieces, you can leave the skin on as long as you aren't using Russet potatoes. Add the following ingredients to the slow cooker. *Only use 3 cups of the chicken broth and reserve the rest for later.
1½ pounds boneless/skinless chicken breasts, 2½ cups corn, 1 medium sweet or yellow onion, 2 ribs celery, 5-6 cloves garlic, peeled and smashed, 2 strips thick cut bacon, 4 Tablespoons butter, 1 pound Yukon gold potatoes, 1½ teaspoons kosher or fine grind sea salt, 4 cups chicken broth, ½ teaspoon black pepper
Mix 4 Tablespoons of flour with ½ cup of chicken broth to create a flour slurry. Make sure it is free of lumps. I like to use a small canning jar with a lid and shake it. *Reserve ½ cup of chicken broth and 2 Tablespoons of flour for the end of slow cooking.
4-6 Tablespoons all purpose flour
Put the lid on the slow cooker and set the temperature to high and slow cook for 3-4 hours or low and slow cook for 6-7 hours. Use the chart in the notes to determine the approximate time based on the slow cooker you are using. The chowder is done when the chicken is easily shreddable and the potatoes are fork tender, but not falling apart. The temp of the chicken will be between 200-210℉/93-99℃. Don't worry, it won't be dry or tough.
If you want the chowder to be thicker, combine the remaining 2 Tablespoons of flour with the ½ cup of broth and mix or shake until it is a smooth mixture. Add to the slow cooker with the cream and stir. Let it cook another 10-15 minutes to cook the flour. Stir and Serve.
I have tested this recipe in the Ninja Foodi Possible Pro Cooker and the Ninja Foodi Pressure Cooker & Air Crisper using the slow cook option on both.These are my suggested cooking times based on the type of slow cooker you are using. Please note that different brands of slow cookers do cook differently so these times are approximates, not absolutes.
Ninja Foodi Possible Pro Cooker: High for 3 hours or Low for 6 hours
Ninja Foodi Pressure Cooker & Air Crisper: High for 5 hours
Ninja Combi: High for 3-4 hours and Low for 5-6 hours
Crock Pot or other slow cooker with a ceramic insert: High for 4-5 hours and Low for 6-7 hours