Best spices to use on minced quorn in spaghetti sauce and other recipes [closed]

Simple answer: I would recommend using whatever herbs or spices you would use if you made the same dish with meat. So, for a Bolognese sauce, I would pick thyme and bay, for an "alla vodka" sauce, basil and garlic, and for Marinara, oregano and peppercorn. Given that the underlying product (quorn) has virtually no flavor of its own -- or, to the extent it does, it is not a flavor I personally would seek to highlight -- I would not worry about which herb or spice best complements it.

To add depth of flavour to Quorn mince, I fry the Quorn mince for a few minutes or until browned, and then add small quantities of vegetable stock, allowing it the stock to be absorbed or boil off between each addition. This bulks up the mince somewhat and flavours the mince before continuing to add other ingredients as per whatever recipe you're attempting.

I do this for quorn mince when making spaghetti sauce and lasagne.

I have found liquid smoke great for enhancing the "meaty" flavors of various vegetarian dishes that would normally contain meat. Perhaps add some shiitake mushrooms, as well, to provide more umami flavor.

Beyond that, I'd probably go for garlic and oregano in a spaghetti sauce.

In a more general sense, as Bruce said, try to use herbs or spices that would normally go into a traditional version of the particular thing that you're making.