Combine the ricotta, spinach, tomatoes, Parmesan cheese, basil, garlic, sea salt and freshly cracked pepper, to taste. Mix until thoroughly combined.
Rinse the chicken breasts then cut a long horizontal slit along the center of the thin long edge of the chicken breast, nearly through to the other side. Fill the cavity of the chicken breast with the ricotta mixture.
Season each side of the chicken with sea salt and freshly cracked pepper, to taste. Carefully dip the chicken breasts in the panko crumbs until both sides are evenly covered.
Close the slit together with toothpicks (or if you are like me and realize that you don’t have toothpicks, simply break some kebab sticks in half and use them).