In a skillet over medium heat, add the olive oil. Once hot, add minced garlic and sauté until fragrant, about 1 minute.
Add the chopped spinach to the skillet and cook until wilted, about 2-3 minutes. Remove from heat and let cool slightly.
In a mixing bowl, combine the sautéed spinach, ricotta cheese, feta cheese, sun-dried tomatoes, oregano, black pepper, and salt. Add lemon juice and mix until well blended.
Take the chicken breasts and carefully slice them horizontally to create a pocket, ensuring not to cut all the way through.
Stuff each chicken breast with the spinach mixture, and use toothpicks to secure the openings if necessary.
Place the stuffed chicken breasts in a baking dish and sprinkle the grated Parmesan cheese on top.
Bake in the preheated oven for 25-30 minutes, or until the chicken is cooked through and reaches an internal temperature of 165°F (75°C).
Once done, remove from the oven and let rest for 5 minutes before serving.
Notes
Serve on a bed of quinoa or brown rice, garnished with fresh basil and lemon.