1. Prepare the Tortellini

Start by cooking the tortellini according to the package directions. Once done, drain and set aside.

2. Cook the Beef and Vegetables

In a large skillet, heat the olive oil over medium-high heat. Add the thinly sliced beef sirloin and cook for about 5 minutes, or until browned. Remove the beef from the skillet and set it aside.

In the same skillet, toss in the sliced green bell pepper, sliced onion, and minced garlic. Sauté the vegetables for about 5–7 minutes, until softened. Remove from heat and set aside with the beef.

3. Make the Provolone Sauce

In a separate saucepan, melt the butter over medium heat. Add the all-purpose flour and whisk to make a roux. Let it cook for 1 minute.

Slowly pour in the whole milk while whisking constantly to avoid lumps. Continue stirring until the mixture thickens and starts to bubble, about 3-4 minutes. Once thickened, stir in the shredded provolone cheese and grated Parmesan cheese. Keep stirring until the cheese melts into a smooth, creamy sauce. Season with salt and pepper to taste.

4. Combine and Serve

Add the cooked tortellini, beef, and sautéed vegetables into the creamy provolone sauce. Stir gently to coat everything in the sauce, making sure all ingredients are evenly combined.

Serve hot, garnished with fresh parsley or additional Parmesan cheese for an extra touch of flavor.