01 - Preheat the oven to 400°F. Line a baking sheet with parchment paper and set aside.
02 - Heat olive oil in a large skillet over medium-high heat. Add the sliced onions and bell peppers, cooking until tender and lightly caramelized, about 5–6 minutes. Remove from the skillet and set aside.
03 - In the same skillet, add the thinly sliced ribeye. Season with salt, pepper, and dried oregano. Sauté for 2–3 minutes until just cooked through. Remove from heat and set aside with the vegetables.
04 - Slice the baguette in half lengthwise and place both halves cut-side up on the prepared baking sheet.
05 - In a small bowl, combine the softened butter with minced garlic and cream cheese if using. Spread the mixture evenly over the cut surfaces of both bread halves.
06 - Bake the bread for 5 minutes until lightly toasted and fragrant. Remove from the oven.
07 - Layer the sautéed onions and peppers over the toasted bread, followed by the cooked steak. Arrange the provolone cheese slices evenly over the top.
08 - Return the assembled bread to the oven and bake for 8–10 minutes until the cheese is fully melted and bubbly.
09 - Remove from the oven, garnish with chopped fresh parsley, slice into portions, and serve immediately.