Saute onion, celery, carrots, garlic (if you don't make your own broth with these in it)
Add to chicken broth
Add pasta (precooked or not)
Add seasoning... salt if your broth doesn't have any, black pepper, parsley, maybe others... red pepper flakes, turmeric, ginger - for medicinal reasons more than taste so be a bit cautious with them.
Simmer until you like it. Or longer.
It really is that simple. Proportions of any of it don't matter much other than don't make it too thick. The only thing really essential is the broth although the other things have some medicinal value too. So make it even if you don't have some of the ingredients.
If you make your own broth: roast a chicken, remove most of the meat, simmer all the rest in water to cover it. Actually, I sometimes remove the skin too. Add any/all: onions, carrots, celery, garlic, salt, black pepper, parsley, red pepper flakes, maybe other spices. Amounts of the optional things don't matter much although if you put too much in, it may become vegetable broth instead of chicken broth. Simmer for many hours.
Fyi, the capsaicin in hot peppers is better than commercial meds for clearing the upper respiratory parts and helping with coughing. This because it works well and gently - working with and supporting your immune system more than so than many of the commercial formulas do. That isn't handed down by family though, so I forgot it. My parents and grandparents didn't like spicy food.