Bring 4 quarts water to a rolling boil; season with salt. Stir in pasta and cook 8–10 minutes until al dente. Reserve ½ cup pasta water and drain.
Sauce & Add-Ins
Heat olive oil in a large skillet over medium-high. Add turkey, salt, and pepper; cook 5–6 minutes, breaking up meat, until no longer pink.
Add onion and garlic; cook 2–3 minutes until fragrant and translucent.
Stir in tomatoes, broth, Italian seasoning, and red pepper flakes; simmer 4–5 minutes until sauce thickens.
Add pasta, spinach, and reserved pasta water; toss until spinach wilts and sauce coats pasta, about 1–2 minutes.
Remove from heat and stir in Parmesan. Serve garnished with fresh basil if desired.
Notes
Prep Note: I weighed the pasta precisely on my scale to ensure each batch hit the right protein count and cooked evenly.Cooking Note: During testing, keeping the skillet at a steady medium-high heat maintained a gentle bubbling that produced a glossy, cohesive sauce.Storage Note: After refrigeration, the sauce thickened significantly; I found that stirring in a splash of broth when reheating revived the creamy texture without extra effort.