Philly Cheesesteak Sloppy Joes Recipe

Ingredients

• 2 tablespoons unsalted butter
• 1 small white onion, chopped
• 1 green bell pepper, seeded and chopped
• 1 pound lean beef, 90/10 blend
• 1/2 cup beef stock
• 1/4 cup ketchup
• 2 tablespoons Worcestershire sauce
• 1/2 teaspoon garlic powder
• 1/2 teaspoon kosher salt
• 1/2 teaspoon black pepper
• 12 slices provolone cheese, divided
• 6 brioche buns, store-bought or homemade