Heat a large skillet over medium-high heat. Add the oil and swirl to coat.
Add the ground turkey.
Season with a pinch of salt and pepper. Cook, breaking it up with a spoon, until lightly browned and no longer pink, about 5–6 minutes. Transfer to a plate if the pan is crowded, leaving any drippings.
Lower heat to medium.
Add the onion and cook 2–3 minutes until softened. Stir in the garlic and cook 30 seconds, just until fragrant.
Add the zucchini and bell pepper. Season with a little more salt, pepper, Italian seasoning, smoked paprika, and red pepper flakes.
Cook, stirring occasionally, 4–6 minutes until the zucchini is just tender but not mushy.
Return the turkey to the skillet. Stir in tomato paste (if using), cherry tomatoes, and broth. Simmer 2–3 minutes to meld flavors and lightly reduce.
Turn off the heat.
Add lemon juice and most of the chopped herbs. Taste and adjust salt and pepper.
Top with Parmesan or feta if you like, and finish with the remaining herbs. Serve hot.