In a large skillet, heat olive oil over medium heat. Add the sliced onions and green bell pepper, sautéing until they are softened and slightly caramelized, about 7-8 minutes. Stir in the minced garlic and cook for an additional minute until fragrant. Remove the mixture from the skillet and set aside.
In the same skillet, add the ground beef. Season with salt, pepper, and Worcestershire sauce. Cook until browned and cooked through, breaking it up with a spatula as it cooks, approximately 5-6 minutes. Drain any excess fat.
Return the sautéed onion and bell pepper mixture to the skillet with the ground beef, stir to combine, and cook for another 2-3 minutes to heat through and blend flavors.
Preheat your oven to 350°F (175°C).
Slice the hoagie rolls lengthwise but do not cut all the way through to create a pocket. Place them on a baking sheet.
Fill each hoagie roll with the ground beef and vegetable mixture. Top each filled roll with two slices of provolone cheese.
Bake in the oven for 5-7 minutes, or until the cheese is melted and bubbly. If you'd like a golden finish, broil for the last 1-2 minutes, watching closely to prevent burning.
Remove from the oven, and if desired, add optional sliced jalapeños for extra heat. Serve immediately.