> 2 tbsp olive oil
> 2 cups thinly sliced onion
> 1/2 red bell pepper, thinly sliced
> 1/2 green bell pepper, thinly sliced
> 1/2 cup sliced mushrooms
> 1 lb sirloin steak, frozen for about an hour for easy cutting
> 1/4 tsp salt
> ground black pepper
> 2 slices provolone cheese, cut into 8 pieces
> 8 butter dinner rolls or slider rolls
Heat 1 tbsp olive oil in a large skillet over medium-high heat. Sauté onions until softened and starting to brown, about 6 min. Add peppers and mushrooms and cook until vegetable mixture is tender, about another 6-8 min. more. Transfer mixture to a bowl.
Meanwhile, slice steak very thinly and season with salt (in moderation) and pepper. Heat remaining oil in skillet and cook steak slices until browned and cooked through, about 4–5 min.
Top each dinner roll with meat, a piece of cheese and some of the vegetable mixture. Serve while warm.