Prepare the Marinade. In a small bowl, whisk together olive oil, fresh lemon juice, lemon zest, minced garlic, dried oregano, salt, and black pepper. The combination of lemon and garlic makes a bright and flavorful marinade.
Marinate the Chicken. Pat the chicken thighs dry with paper towels (this ensures crispy skin!). Place them in a large resealable bag or shallow dish and pour the lemon marinade over the top. Seal and let the chicken marinate in the refrigerator for at least 30 minutes, or up to 4 hours for more intense flavor.
Preheat the Oven. Preheat your oven to 400°F. Line a baking sheet with foil for easy cleanup and place a wire rack on top to elevate the chicken thighs for even cooking.
Bake to Perfection. Arrange the marinated chicken thighs on the wire rack, skin side up. Place a slice of lemon on top of each thigh. Bake for 35-40 minutes or until the skin is golden and crispy, and the internal temperature of the chicken reaches 165°F.
Garnish and Serve. Once the chicken is done, remove it from the oven and let it rest for 5 minutes. Garnish with fresh chopped parsley and a few lemon wedges on the side for an extra burst of citrus.