Ham tetrazzini

Cook spaghetti according to package directions in salted water.

Melt butter in a large skillet. Add onion and mushrooms and cook until onion is soft and mushrooms are browned.
Add soup, milk, and both peppers to the skillet and mix well.

Add ham, peas, cheddar cheese, and Parmesan cheese and stir and cook over medium heat until cheese is melted. Season to taste with salt.

Add drained pasta to the pan and mix well.