To make the marinade, combine the olive oil, lemon juice, smoked paprika, oregano, minced garlic, chilli flakes, salt , pepper and tabasco.
Mix well to get a paste.
To butterfly the chicken breasts: place your hand on top of a chicken breast, then run a long sharp knife along the side of the chicken.
Slice the chicken breast in half horizontally, but do not cut all the way through.
Open it up, and flatten it, it will have the shape of a butterfly.
Use a meat tenderizer to flatten it down even more to the desired thickeness.
Repeat with the second chicken breast.
Rub the marinade on both sides of each butterfly chicken, then refrigerate for at least 1-2 hours.
Heat up a grill pan, and place one chicken breast at a time.
Grill for about 3 minutes on each side or until cooked through.