01 -
Preheat the oven to 400°F (204°C).
02 -
Heat a skillet over medium-high heat. Add olive oil and swirl to coat. Add bell pepper and onion slices, seasoning with salt, pepper, and optional garlic powder. Sauté for 5 to 7 minutes until vegetables are softened and lightly caramelized.
03 -
Lay the roast beef slices flat on a clean cutting board. Place a spoonful of the cooked pepper-onion mixture along one short edge of each beef slice. Top each with one slice of provolone cheese, adjusting size as needed.
04 -
Gently roll each beef slice around the filling to form a tight log. Place each roll seam side down in a baking dish, packing them closely together to help hold their shape.
05 -
Transfer the baking dish to the preheated oven and bake for 10 minutes, or until cheese is melted, bubbly, and beginning to brown.
06 -
Allow roll ups to rest for 1 to 2 minutes before serving to let cheese set and avoid burns.