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.