Heat the pan: Set a large skillet over medium-high heat and add the olive oil. When it shimmers, add the onion with a pinch of salt.
Cook 3–4 minutes, stirring, until softened.
Sauté the mushrooms: Add the sliced mushrooms. Spread them out and let them cook undisturbed for 2 minutes to brown. Stir and cook another 3–4 minutes until they release their moisture and start to caramelize.
Add garlic and spices: Stir in the garlic, smoked paprika, thyme, and red pepper flakes if using.
Cook 30 seconds until fragrant.
Brown the turkey: Push the veggies to the sides of the skillet. Add the ground turkey to the center and season with salt and pepper. Cook 5–7 minutes, breaking it up with a spatula, until no pink remains and it’s lightly browned.
Build the sauce: Stir in the tomato paste and cook 1 minute to toast it.
Add the Worcestershire and chicken broth, scraping up any browned bits from the bottom of the pan.
Simmer to thicken: Reduce heat to medium and let it bubble gently for 3–4 minutes, until the liquid reduces and the mixture is saucy but not wet.
Finish with greens and lemon: Fold in the spinach and cook 1–2 minutes until wilted. Squeeze in the lemon juice and taste. Adjust salt, pepper, or heat as needed.
Serve: Sprinkle with chopped parsley.
Serve over rice, quinoa, mashed potatoes, cauliflower rice, or spooned into tortillas.