Also known as "Anything Goes" pasta. This is a last minute dish, which can include leftovers.
First cut everything up. A typical selection would be bacon, onions, green peppers, and leftover peas. Cook what needs to be cooked, all together, stiry fry style, and heat through any leftovers at the end. There are endless alternatives possible here, and I'll list some of those afterwards.
Meanwhile boil the pasta, and grate a generous amount of cheese. I use mostly cheddar with a little parmesan, but you can use mozarella if you want that stringy thing going on, or any cheese you have really. When the pasta is cooked, drain it, stir in a knob of butter, then the cheese. The knob of butter is vital, or the cheese will be lumpy. Add herbs or spices if desired.
Combine the stir fry with the cheesy pasta and serve.
Suitable meats include (but are not limited to) ground beef, ground pork, chopped up cooked roast meat, sausages, ham (fresh, leftover, canned, you name it), diced chicken or turkey, shrimp, and of course tuna or salmon.
Veggies include mushrooms, zucchini, green beans, canned beans, olives, corn kernels, peppers of any kind, including hot if you like them, brussels sprouts (yes really), broccoli, spinach, and more.
Many "named" pasta dishes are really versions of this.
A slightly fancier version is to make a cheese sauce instead of just melting cheese on the pasta.