Heat a skillet on medium heat and add the olive oil. Add the bell peppers, broccoli, sausage, oregano, zucchini, yellow squash, and a couple dashes of salt.
Stir as the vegetables cook. Let cook until the vegetables start to lightly brown around the edges (about 7 minutes).
To the pan, add the cooked pasta, milk (or cream), Parmesan cheese, pepper, parsley and capers (optional).
Stir all of the ingredients together and cook for another 5 minutes. Serve right away while warm.
Squeeze fresh lemon juice from a lemon quarter over each serving.