In a medium bowl prepare the spice rub by combining garlic powder, onion powder, paprika, ground pepper, oregano, and salt.
Coat the chicken breasts with a tablespoon of butter and sprinkle the spice rub all over.
Heat a large skillet with the oil and add the chicken breasts. Cook for 4-5 minutes per side until the chicken breasts turn crispy and blackened. Remove the chicken and keep it aside.
In the same skillet add the butter. Once the butter has melted add the garlic and parsley. Cook for 2 minutes until the garlic turns crispy golden.
Return the chicken to the skillet with few lemon slices. Let it simmer in butter sauce for 2 minutes.
Serve the chicken while it is still warm along with the butter sauce and fresh parsley.