Prep everything first: halve the cherry tomatoes, thinly slice the red onion, mince the garlic, and pick/torn the basil. Having ingredients ready lets you move quickly at the stove — key for bright-tasting vegetables and preventing the spinach from overcooking.

Heat a large heavy skillet (cast iron or stainless steel) over medium-high heat for 1–2 minutes until hot. Add 1 tablespoon of the olive oil and swirl to coat. Heating the pan before the oil ensures an immediate sizzle when the meat hits the surface so it browns instead of steams.

Add the ground turkey in an even layer and let it sit undisturbed for 2–3 minutes to develop a golden crust — this Maillard browning is where deep savory flavor comes from. Break the meat apart with a spatula and continue cooking until mostly browned, about 4–5 more minutes. Season lightly with salt and freshly ground black pepper while it browns to help draw moisture out and concentrate flavor.

Push the turkey to one side of the skillet. Add the remaining 1 tablespoon olive oil to the empty side, then add the sliced red onion and a pinch of salt. Sauté 2–3 minutes until the onion softens and starts to color — cooking onion separately gives better caramelization and layers the dish with sweetness.

Stir the onion into the turkey, then add the minced garlic and red pepper flakes (if using). Cook 30–45 seconds, stirring constantly — garlic cooks quickly; this short time tempers its raw bite and blooms its flavor without burning.

Add the halved cherry tomatoes and increase heat to medium-high. Cook 3–5 minutes, stirring occasionally, until the tomato skins begin to soften and some tomatoes burst. As they break, they release juices that mix with the turkey to make a light, flavorful pan sauce. Use your spatula to gently press a couple of tomatoes to encourage sauciness.

Reduce heat to medium. Add the baby spinach in batches, stirring each addition until it wilts down before adding more — this keeps steam controlled so the spinach becomes tender but still vibrant green. Cooking spinach briefly preserves its nutrients and fresh flavor.

Tear in most of the fresh basil (reserve a little to finish), taste, and adjust seasoning with salt and pepper. If the pan looks dry, add a splash (1–2 tsp) of water to loosen the pan juices and marry the flavors. Allow everything to heat through for 1 minute so flavors meld.

Turn off the heat and finish with a drizzle of olive oil (optional) and the remaining torn basil. Serve directly from the skillet or transfer to a warmed platter. The finishing oil adds gloss and mouthfeel while fresh basil gives an aromatic lift that smells like Italy.

Serve suggestions: spoon over creamy polenta, cooked short pasta (like orecchiette or penne), cauliflower rice, or enjoy as-is with crusty bread. The dish keeps in the fridge for 3 days — reheat gently to avoid drying the turkey.