In a mixing bowl, combine the ricotta cheese, chopped spinach, mozzarella cheese, minced garlic, dried oregano, salt, and black pepper. Mix well until all ingredients are fully incorporated.
Pat the chicken breasts dry with paper towels, and then make a pocket in each breast by slicing horizontally, being careful not to cut all the way through.
Stuff each chicken breast with approximately ¼ of the ricotta mixture, ensuring it is filled generously.
Heat olive oil in an oven-safe skillet over medium-high heat. Add the stuffed chicken breasts to the skillet, searing each side for about 4-5 minutes until golden brown.
Transfer the skillet with the chicken to the preheated oven and bake for an additional 20-25 minutes, or until the chicken is cooked through and reaches an internal temperature of 165°F (75°C).
Remove the skillet from the oven and let the chicken rest for 5 minutes before slicing.
Serve the stuffed chicken garnished with halved cherry tomatoes and fresh basil leaves on top for an added burst of flavor.
Notes
Let the chicken rest before slicing for better juiciness.