Creamy Cajun Chicken Pasta

Ingredients
For the Pasta:

12 oz pasta (penne or fettuccine)
For the Sauce:

2 tablespoons olive oil
1 lb chicken breast (sliced)
1 onion (chopped)
3 cloves garlic (minced)
1 yellow bell pepper (diced)
1 tablespoon Cajun seasoning
1 cup heavy cream
1 cup grated Parmesan cheese
Salt and pepper, to taste
Chopped green onions or parsley for garnish
Preparation