Philly Cheesesteak Soup

In a large pot over medium heat, heat 1 tablespoon oil. Add half the onion and cook until soft, 6 minutes. Add garlic and cook until fragrant, 1 minute. Add flour and whisk until golden, 2 to 3 minutes. Add broth and let simmer, 15 minutes. Meanwhile, in a large skillet over medium-high heat, heat remaining oil. Add steak, onions, and green peppers and cook, stirring occasionally, until steak is cooked through, 10 to 12 minutes. Stir in Worcestershire and season with salt and pepper. Add cheese to soup and stir until melted. Add steak mixture to soup and let heat through, 3 minutes. Meanwhile, heat broiler. Ladle soup into oven-safe ramekins and top with baguette slice and additional provolone. Broil until cheese is browned and bubbly, 2 to 3 minutes.