Step 1: Get a large pot of salted water boiling for your tortellini. Cook the cheese tortellini according to package directions until al dente. Drain well and set aside.
Step 2: While tortellini cooks, heat olive oil in a large skillet over medium-high heat. Add the thinly sliced steak and cook until beautifully browned. Remove steak from skillet and set aside.
Step 3: In the same skillet, add the sliced onion, green pepper, red pepper, and minced garlic. Sauté over medium heat for about 5-7 minutes, until vegetables are tender and fragrant. Remove veggies from skillet and set aside with the steak.
Step 4: In the same skillet, melt 2 tbsp butter over medium heat. Whisk in the flour and cook, stirring constantly, for about 1 minute to create a roux.
Step 5: Gradually whisk in the milk, a little at a time, until smooth and the sauce begins to thicken to your desired creamy consistency.
Step 6: Reduce heat to low. Stir in the shredded provolone cheese until completely melted and the sauce is smooth and creamy.
Step 7: Return the cooked steak, sautéed vegetables, and cooked tortellini to the skillet with the sauce. Gently toss everything to coat all ingredients evenly.
Step 8: Season generously with salt and pepper to taste. Dish out into bowls, garnish with fresh parsley, and serve immediately.