If grilling, preheat your grill to medium-high heat.

If baking, preheat your oven to 400°F (200°C).

Pat the chicken breasts dry with a paper towel.

In a small bowl, mix garlic powder, onion powder, paprika, oregano, salt, and black pepper.

Rub the chicken slices evenly with olive oil, then coat with the spice mixture.

Grilling: Place the chicken on the grill and cook for 4-5 minutes on each side or until the internal temperature reaches 165°F.

Baking: Arrange chicken slices on a baking sheet lined with parchment paper. Bake for 12-18 minutes, flipping halfway, until the chicken reaches an internal temperature of 165°F.

Remove the chicken from the heat and let it rest for 3-5 minutes to retain its juices.

Serve warm with your favorite side dishes like roasted vegetables or rice. Garnish with fresh lemon slices, if desired.