In a large skillet on medium-high heat, heat two tablespoons olive oil. Saute garlic, red pepper flakes, and coarse black pepper for 2-3 minutes.
Add in thin strips of chicken breast, ¼ teaspoon salt, and cook until chicken is cooked through. This should only take a few minutes because the chicken is cut thin.
Add in marinara sauce and stir. Add in Alfredo sauce and stir. Let the sauces simmer for about 10 minutes.
To the sauce, add two tablespoons butter and ½ cup peas. Stir until the butter melts.
Combine the sauce mixture with cooked pasta. Garnish with fresh Parmesan cheese, and a pinch or two of red pepper flake.
Notes
If you want to take the spicy level down, I recommend cutting back (or completely cutting out) the red pepper flakes completely.(Recipe from Center Cut Cook)