I saw this on Better Homes & Gardens TV show, then in a magazine. It's become a family favorite - so light and yet so tasty!
The "sauce" freezes well and reheats easily.
Melt butter in the same pan and then cook the onions until they have caramelised.
Add the mushrooms, garlic and thyme/herbs and the bacon again and reduce the heat to low.
Cook your pasta and then, using tongs or a spathetti spoon, add it to the pan with the bacon mixture in it. Do not drain as the liquid will help moisten the whole.