1. In a large skillet over medium heat, heat 1 tablespoon of oil. Add onion and bell peppers, seasoning with oregano, salt, and pepper. Cook until tender, about 10 minutes. Remove from skillet.
2. Heat remaining oil in the skillet. Add steak in a single layer, seasoning with salt and pepper. Cook until seared on one side, about 2 minutes. Flip and cook for another 2 minutes for medium.
3. Return onion mixture to the skillet, toss to combine. Sprinkle provolone over the steak and cover with a lid until cheese melts, about 1 minute.
4. Arrange lettuce on a platter. Scoop steak mixture onto each leaf, garnish with parsley, and serve warm.

PREP TIME & NUTRITION:
Prep Time: 10 mins, Servings: 4, Calories: 446, Net Carbs: 5g, Fats: 30g, Protein: 36g