01 - Bring a large pot of salted water to a boil. Cook high-protein pasta according to package directions until al dente. Drain and set aside.
02 - Heat a large nonstick skillet over medium-high heat. Add ground beef and cook, breaking up with a spoon, until browned and cooked through, about 6-7 minutes. Drain excess fat if needed.
03 - Add chopped onion to the skillet and cook 3-4 minutes until softened. Stir in garlic and cook 1 minute until fragrant.
04 - Add spinach to the skillet and stir until wilted, about 2 minutes.
05 - Reduce heat to low. Stir in cream cheese and milk, mixing until smooth sauce forms. Add Parmesan, Italian herbs, black pepper, and salt. Simmer gently 2-3 minutes.
06 - Add cooked pasta to the sauce, tossing gently to combine and coat evenly.
07 - Taste and adjust seasoning. Sprinkle with extra Parmesan and red chili flakes if desired. Serve hot.