01 - Bring a large pot of salted water to a boil. Cook the tortellini according to package instructions until al dente. Drain thoroughly and set aside.
02 - While pasta cooks, season steak cubes evenly with 1/2 teaspoon salt and 1/2 teaspoon black pepper, coating all sides.
03 - Heat a large skillet over medium-high heat. Add 1 tablespoon butter and sear steak cubes for 2-3 minutes per side until well-browned and cooked to desired doneness. Remove steak and set aside on a plate.
04 - Reduce skillet heat to medium. Add remaining 1 tablespoon butter and minced garlic. Sauté for 1 minute until fragrant, being careful not to burn the garlic.
05 - Pour in heavy cream, stirring to deglaze the pan and incorporate browned bits. Add Parmesan cheese, Italian herbs, red pepper flakes, and a pinch of salt and pepper. Simmer for 2-3 minutes until sauce slightly thickens and coats the back of a spoon.
06 - Add cooked tortellini and seared steak back to the skillet. Toss gently to coat everything evenly in the sauce. Heat through for 1-2 minutes. Remove from heat, garnish with chopped parsley and additional Parmesan. Serve immediately while hot.