Can I add uncooked noodles directly to soup?

That's how I cook noodle soup. And yes, it does give them a nice flavor. Just be sure you don't add them too soon: it's easy to over-cook the noodles by leaving them too long in the hot broth.

Some people prefer to cook them separately because when you do so, you can see the water changes color a little and they don't want that (mainly flour) in their soups.

Another advantage is that you can have your soup ready and just cook the noodles on demand. The noodles go to boiling water, the soup is just very hot, but not boiling. That's what restaurants do.

If those reasons are not important for you, do as most of us do and cook them together :)

Well first of all, any sauce you make that'll have pasta in it, must have at least 1 to 2 tablespoons of pasta water in it, i.e. 1 to tbsp of the water you boiled the pasta with.

Second of all, it's all about the amount. If let's say you're adding a 1/2 cup of rigatoni or fussili then you're fine, add'er up; but be advised when reheating, pasta will break easily on you. If you're putting let's say skinny noodle type pasta, then don't put it from the start. What you can do is half boil the pasta in the normal water, drain it, and then add it to your soup 5 / 10 minutes before it's done.

I would say NEVER cook noodles at the same time for all the reasons the smart friends above suggested. But my adamant reason is that it makes the soup look and taste like dishwater!

With a cream-based soup the added starch adds desired thickness. It isn't worse for the soup than adding corn starch or extra flour, and color change would be indistinguishable. Same for a tomato-based soup, or an egg-flower soup.

I like robust soups in general, and I think throwing the water out in general is a terrible thing to do to a food product. Any soup that calls for discarding more nutrients and flavor from a product already 'enriched' out of the crop's natural value isn't one I'd be interested in cooking. Cooking flavor into the noodles beats wringing more out.

I suppose it you prefer a clear light soup, it would preferably be better to cook the noodles separately and then pour broth over to maintain the clearness of the broth and texture of the noodle.

Any soup I cook that requires noodles gets put in the same pot as the other ingredients. The noodles will have more flavor and it helps thicken up the soup for a heartier meal. I have been doing this for quite a while and it is the ONLY way I cook noodles when they are going in a soup. It really doesn’t have a different taste.

I will add uncooked noodles to soup that have been soaked for 1 hr. As for thickeners, I prefer potato flour that keeps the broth a clear and translucent look. Potato flour goes a long way as a thickener~go for 1/4 normal & add more if required.

In my opinion, just no. Lol it changes the clarity and viscosity of a carefully crafted broth/sauce. If you have leftovers the noodles will have absorbed most of the liquid by the next day, leaving you a gelatinous pile of goop. It takes minutes to boil them separately and you can add to your serving bowl as needed. You will enjoy the end result far more. Do add a bit of the noodle's cooking liquid to your broth/sauce, but don't over do it. Every time I see a recipe advising cooking noodles on the main dish, I keep on scrolling. That's just lazy.