01 - Bring a large pot of salted water to a boil. Cook tortellini according to package directions until al dente. Drain thoroughly and set aside.
02 - While pasta water heats, liberally season steak cubes with 1/2 teaspoon salt and 1/2 teaspoon black pepper on all sides.
03 - Heat a large skillet over medium-high heat. Add 1 tablespoon butter and sear seasoned steak cubes for 2-3 minutes per side until well-browned and cooked to desired doneness. Transfer steak to a plate and reserve.
04 - Reduce skillet heat to medium. Add remaining 1 tablespoon butter and minced garlic. Sauté for 1 minute until fragrant but not browned.
05 - Pour heavy cream into skillet, stirring to scrape up browned bits from bottom. Add Parmesan, Italian herbs, red pepper flakes, and a pinch of salt and pepper. Simmer for 2-3 minutes until sauce coats the back of a spoon.
06 - Return cooked tortellini and seared steak to skillet. Gently toss to coat everything evenly in sauce. Heat through for 1-2 minutes. Remove from heat, garnish with fresh parsley and additional Parmesan. Serve immediately.