Preheat oven to 400 °F (200 °C).
Wash the chicken, pat dry with a paper towel and in each piece with a knife cut a small pocket.
In a small bowl, mix cream cheese, pecorino cheese, oregano and chives, season with salt and pepper.
Fill the chicken pockets with about 2 tablespoons of the cheese mixture. Close pockets with toothpicks or kitchen string.
Bake in the oven for 8 minutes.
Meanwhile, mix the chicken stock and white wine. Turn down oven heat to 350 °F ( 180 °C).
Pour chicken stock and wine mixture over chicken and bake for about 35 minutes, until crispy, basting with the pan juices from time to time.
Add washed cherry tomatoes and bake more for 8-10 minutes.
Serve warm with baked potato wedges.