Preheat your oven to 375°F (190°C) and prepare a baking dish lined with parchment paper.

Using a sharp knife, make several deep cuts into each chicken breast, about 1 inch apart, ensuring not to slice all the way through.

In a mixing bowl, combine the chopped fresh spinach, crumbled goat cheese, and halved cherry tomatoes; mix until well-distributed.

Drizzle olive oil over chicken breasts and sprinkle with garlic powder, onion powder, dried oregano, salt, and pepper to taste.

Gently stuff each cut in the chicken with the filling, pressing it in gently.

Place the stuffed chicken in the baking dish and drizzle remaining olive oil over the top. Bake for 25 to 30 minutes until the internal temperature reaches 165°F (75°C).

Remove from the oven, allow to rest for about 5 minutes, then prepare fresh basil for garnish.

Slice the chicken carefully and arrange it on a plate, garnishing with fresh basil leaves.