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