01 - 
                Heat olive oil in a large skillet over medium-high heat. Cook bell pepper, onion, and mushrooms until softened, about 5 minutes.
              
              
              
                02 - 
                Add sliced steak to vegetables and season with salt, pepper, and garlic powder. Brown for 2-3 minutes.
              
              
              
                03 - 
                Whisk together cornstarch, beef broth, heavy cream, and Worcestershire sauce until smooth. Pour into the skillet.
              
              
              
                04 - 
                Add penne, bring to boil. Reduce heat, cover, and simmer for 15 minutes, stirring occasionally.
              
              
              
                05 - 
                Stir in 1/2 cup mozzarella, sprinkle remaining on top. Cover and cook 5 minutes until melted.