Spicy Shrimp Alfredo with Red Peppers and Mushrooms

I never thought of adding cayenne pepper to alfredo sauce but it gives it such a great kick! I love spicy food so I always add more cayenne. Just a hint...add the cayenne a little at a time in case 1 teaspoon is too spicy for you.

Spicy Shrimp Alfredo with Red Peppers and Mushrooms

1 pound 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 cup heavy cream
1 teaspoon cayenne pepper, or more to taste
Salt and pepper to taste
1/4 cup chopped parsley

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.
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. 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.