Step 1: Prep Your Ingredients

1. Slice your beef, vegetables, and mushrooms thinly for even cooking.
2. Toast your hoagie rolls lightly if desired and set aside.

Step 2: Sauté the Vegetables and Mushrooms

1. Heat 1 tablespoon of olive oil in a large skillet over medium heat.
2. Add the onion, bell pepper, and mushrooms. Sauté for 5-7 minutes until softened.
3. Season with a pinch of salt and pepper. Remove from the skillet and set aside.

Step 3: Cook the Beef

1. In the same skillet, add the remaining tablespoon of olive oil.
2. Add the thinly sliced beef and sprinkle with garlic powder, salt, and pepper.
3. Cook for 3-5 minutes until the beef is browned and cooked through.

Step 4: Assemble the Sandwich

1. Reduce the heat to low. Return the cooked vegetables and mushrooms to the skillet, mixing them with the beef.
2. Divide the mixture into 4 portions in the skillet.
3. Place 1-2 slices of provolone cheese on each portion. Cover the skillet for 1-2 minutes to melt the cheese.

Step 5: Build the Sandwich

1. Using a spatula, scoop each cheesy beef-and-veggie portion onto a toasted hoagie roll.
2. Add optional toppings like mayo, mustard, or hot sauce.
3. Serve warm and enjoy!