Select Sauté and add butter to the pressure cooker pot. When butter is melted, add the onion and cook, stirring occasionally until the onion starts to soften about 1 to 2 minutes. Add the carrots and celery and sauté for about 5 minutes stirring occasionally.
Add turkey stock and turkey. Lock lid in place. Select High Pressure. Set timer for 5 minutes. When beepers sounds, wait 5 minutes and then use a quick pressure release to release pressure. When valve drops, carefully remove lid. Add salt and pepper to taste.
Serve soup spooned over prepared egg noodles.
You can also make the soup in a pot on the stove. After sautéing vegetables, bring to a boil, cover and simmer until vegetables are tender about 15 minutes.
TIP: I like to make up a big pot of soup and freeze it in individual servings in freezer zipper bags for lunches. Many soups freeze well, but soups with noodles, potatoes or rice freeze better if you freeze the noodles, potatoes or rice in a separate single serving bags and reheat them separately.