"What you see here is a whole lot of onions sautéing in vegetable oil with jalapenos and a cut up chicken sausage."

There is nothing wrong with that, except I would use either Avocado or Olive Oil, never Vegetable Oil. Vegetable Oil is so very unhealthy for you. Don't let the word "vegetable" fool you, as it has done to so many people. Vegetable Oil is one of the absolute worst oils we have available today, if not the worst.

I would encourage you to read this article:
https://elmhurst1925.com/blogs/news/why-vegetable-oils-are-bad-for-you