Pesto Peppers and Sausage

1 pkg linguine
1 pkg cooked sausage, sliced (you know the kind that comes in the shape of a "u" - I get the turkey sausge)
1 red bell pepper, cut into strips
1 green pepper, cut into strips
12 oz. pkg mushrooms, sliced
1 pkg powdered pesto sauce (can use jarred, also)
2 roma tomatoes, cut into chunks
salt/pepper to taste
parmesan cheese, shredded (if you never have, buy a chunk and freshly grate it - it's an unbelievable difference to the pre-shredded kind)

Cook pasta according to package directions. Meanwhile, saute sausage, peppers and mushrooms together with some cooking spray or a little bit of oil. Sprinkle pesto powder on the sausage and veggies while they are cooking. (You really don't need to add water - you usually get plenty from the veggies as they cook. But you can add a little water if needed.) Once the peppers and mushrooms are soft, add the tomatoes and cook for another minute. Serve over linguine and top with parmesan cheese.