Pasta is a quick and easy dish in our house. For a sauce I usually start off making a base of pancetta, onions and pepper in a frying pan. Start off by cooking the pancetta until browning and then add the onions and peppers. When the onions and pepper are softened add sliced mushrooms. As the mushrooms cook add some spinach.
This is the base for a variety of pasta sauces.
Add to freshly cooked pasta with pesto for pesto pasta.
Add a tin of chopped tomatoes (or a carton of passata) for a tomato sauce.
For a creamy sauce, I usually stir in a jar of crème fraîche. I always try and use a quality crème fraîche rather than the standard supermarket own brand.
Add parmesan to taste.
I sometimes cook some mushroom separately and add those as an addition to the pasta.