01 - Heat olive oil in a large skillet over medium heat. Add the diced onion and sauté for 3–4 minutes until translucent.
02 - Add the minced garlic and cook for 30 seconds until fragrant.
03 - Add the ground turkey. Cook, breaking it up with a spatula, until browned and cooked through, about 6–8 minutes.
04 - Stir in the roasted red peppers, salt, pepper, oregano, and red pepper flakes. Cook for 2 minutes to combine flavors.
05 - Add the chopped spinach and cook until wilted, about 1–2 minutes.
06 - Reduce heat to low. Stir in the pesto until everything is well coated and heated through, about 2 minutes.
07 - Sprinkle with grated Parmesan cheese and garnish with fresh basil leaves if desired. Serve hot.