01 - Bring a large pot of salted water to a rolling boil. Add tortellini and cook according to package directions until al dente. Drain thoroughly and set aside.
02 - Pat steak cubes dry with paper towels. Season generously on all sides with salt and black pepper, pressing seasoning into the meat.
03 - Heat a large skillet over medium-high heat until smoking. Add 1 tablespoon butter and sear steak cubes in batches for 2-3 minutes per side until well-browned and cooked to desired doneness. Transfer to a plate and reserve.
04 - Reduce skillet heat to medium. Add remaining butter and minced garlic. Sauté for 1 minute until fragrant but not browned.
05 - Pour heavy cream into the skillet, scraping up browned bits from the bottom. Whisk in Parmesan, Italian herbs, red pepper flakes, and a pinch each of salt and pepper. Simmer for 2-3 minutes until sauce coats the back of a spoon.
06 - Add cooked tortellini and seared steak to the skillet. Gently toss to coat evenly in sauce. Cook for 1-2 minutes until heated through. Remove from heat, garnish with parsley and additional Parmesan. Serve immediately.