Peppered shrimp alfredo

Recipe from Allrecipes, I just have to try it!
"A jar of Alfredo sauce gets an added kick with cayenne pepper, Romano cheese, and extra cream. Served with red bell peppers, shrimp, and penne pasta, this is one rich dish!"
Ingredients:
12 ounces penne pasta
1/4 cup butter
2 tablespoons extra-virgin olive oil
1 onion, diced
2 cloves garlic, minced
1 red bell pepper, diced
1/2 pound portobello mushrooms, diced
1 pound medium shrimp, peeled and deveined
1 (15 ounce) jar Alfredo sauce
1/2 cup grated Romano cheese
1/2 cup cream
1 teaspoon cayenne pepper, or more to
taste
Salt and pepper to taste
1/4 cup chopped parsley

Directions:
1. Bring a large pot of lightly salted water to a boil. Add pasta and cook for 8 to 10 minutes or until al dente; drain.
2. Meanwhile, melt butter together with the olive oil in a saucepan over medium heat. Stir in onion, and cook until softened and translucent, about 2 minutes. Stir in garlic, red pepper, and mushroom; cook over medium-high heat until soft, about 2 minutes more.
3. Stir in the shrimp, and cook until firm and pink, then pour in Alfredo sauce, Romano cheese, and cream; bring to a simmer stirring constantly until thickened, about 5 minutes. Season with cayenne, salt, and pepper to taste. Stir drained pasta into the sauce, and serve sprinkled with chopped parsley.