Heat The Olive Oil And Butter In A Skillet Over Medium Heat. Stir In The Bell Pepper And Onion; Cook And Stir Until The Onion Has Softened And Turned Translucent, About 5 Minutes. Stir In The Garlic, And Cook Until Fragrant, About 1 Minute More. Add The Shrimp And Cook Until Opaque, About 2 Minutes On Each Side. Stir In The Tomato Sauce, Parsley, And Red Pepper Flakes, And Cook Until Tomato Sauce Is Warmed Through, About 5 Minutes. Season With Salt And Pepper.