01 -
In a large mixing bowl, toss the thinly sliced top sirloin with salt and black pepper. Coat the beef evenly with 2 tablespoons of all-purpose flour.
02 -
Heat a skillet over medium-high heat and sear the beef in batches until browned on the outside but still pink inside. Remove beef and set aside.
03 -
In the same skillet, add onions and sliced mushrooms. Cook until onions become translucent, stirring occasionally.
04 -
Stir in garlic powder, remaining flour, salt, black pepper, and Worcestershire sauce into the vegetables.
05 -
Gradually pour in beef broth while stirring continuously until the mixture thickens. Reduce heat to medium-low and simmer for 30 minutes.
06 -
Add the thinly sliced sweet bell peppers during the last 10 minutes of cooking. Return the seared beef to the pot to warm through.
07 -
Ladle the stew into bowls and top each serving with slices of provolone cheese. Serve hot, optionally with garlic toast or hollowed-out bread bowls.