Bring a large pot of salted water to a boil. Cook the tortellini according to package directions until tender but still firm to the bite. Reserve ½ cup of pasta water, then drain and set aside.

Pat the steak pieces dry. Season with Cajun seasoning, smoked paprika, garlic powder, salt, and black pepper.

Heat olive oil in a large skillet over medium-high heat, then sear the steak bites for 2–3 minutes per side until cooked to your liking. Remove and let rest.

Reduce heat to medium and melt butter in the same skillet. Add minced garlic and sauté until fragrant, about 1 minute.

Stir in red pepper flakes, Dijon mustard, and lemon juice, and mix in parsley and chives.

Toss the cooked tortellini and steak bites back into the skillet, adding reserved pasta water as needed to create a silky sauce. Stir in Parmesan cheese until melted and creamy.

Plate while hot, garnishing with extra Parmesan, fresh parsley, and a sprinkle of Cajun seasoning for that extra flair. Enjoy immediately!