Heat olive oil in a large skillet over medium-high heat. Add the thinly sliced sirloin steak, season with salt and pepper, and cook for 3-4 minutes until browned. Remove and set aside.
In the same skillet, add sliced onion, green bell pepper, and red bell pepper. Sauté for 5-7 minutes until tender and slightly caramelized. Add minced garlic and cook for an additional minute.
Return the cooked steak to the skillet with the sautéed vegetables. Stir in Worcestershire sauce and soy sauce. Cook for another 2-3 minutes until heated through.
Divide cooked brown rice among four bowls. Top each bowl with the steak and vegetable mixture, then sprinkle shredded provolone cheese over the top. Cover for a couple of minutes to let the cheese melt. Garnish with fresh chopped parsley.