Prep & Sauté the Veggies - Slice the purple onion and green bell pepper into strips. In a large skillet over medium heat, add olive oil and toss in the veggies. Season with salt, pepper, and garlic powder. Sauté until softened, about 5–7 minutes.

Cook the Philly Cheesesteak - Add the sirloin Philly steak into the skillet with the veggies. Cook everything together according to the instructions on the steak package, until the meat is fully cooked and tender.

Once the meat and veggies are done, transfer them to a bowl and set aside.

Make the Creamy Sauce - In the same skillet, pour in 1 cup of heavy whipping cream. Add the cream cheese and mozzarella cheese. Stir constantly over medium heat until melted and smooth — about 5 minutes.

Return the cooked steak and sautéed vegetables to the pan with the cream sauce. Stir to combine and let everything simmer on low heat.

In a separate pot, cook the cheese tortellini according to package instructions. Drain and add them into the creamy Philly cheesesteak mixture.

Mix everything well to coat the tortellini in that luscious sauce. Serve hot and enjoy every bite of this cheesy, hearty comfort dish!