- Heat olive oil in a large pot over medium heat. Sauté the diced onion for about 3-4 minutes, until translucent. 
- Add garlic and cook for another 30 seconds, just until fragrant. 
- Add chicken thighs, oregano, salt, pepper, and red pepper flakes. Cook for 6–8 minutes until the chicken is no longer pink. 
- Stir in sun-dried tomatoes and chicken broth. Bring to a simmer and let cook for 15 minutes. 
- Reduce heat to low. Stir in heavy cream and parmesan until melted and smooth. 
- Add chopped spinach and simmer for another 2–3 minutes, just until wilted. 
- Taste and adjust seasonings if needed, then serve hot with crusty bread.