Preheat the oven to 400°F (200°C).
Rinse the chicken breasts under cold water and pat them dry with paper towels.
In a small bowl, combine olive oil, garlic powder, paprika, oregano, salt, pepper, and lemon juice if using. Stir until well mixed.
Place the chicken breasts in a baking dish and brush the spice mixture evenly over both sides of each breast.
If desired, cover the baking dish with aluminum foil to retain moisture.
Bake in the preheated oven for 20-25 minutes, or until the internal temperature reaches 165°F (75°C). Use a kitchen thermometer to check.
Remove from the oven and let the chicken rest for 5 minutes before slicing.
Serve the chicken with your choice of sides, such as roasted vegetables or a green salad for a balanced meal.