Preheat the oven to 425°F (218°C). Lightly brush or mist a baking sheet with olive oil.
Pat the chicken thighs dry with paper towels and set them on the prepared baking sheet.
In a mixing bowl, combine the lemon zest, salt, black pepper, dried basil, dried thyme, dried rosemary, garlic powder, and red pepper flakes.
Drizzle 1 1/2 tablespoons of the olive oil over the chicken and rub to coat each piece, then sprinkle the seasoning mix evenly over the thighs.
Arrange the peeled garlic cloves and the thinly sliced Meyer lemons around and on top of the chicken.
Slice off the top of the whole garlic head to expose the cloves, remove any loose papery skin, place it cut-side up on the sheet, and drizzle the remaining olive oil over the chicken, lemons, and garlic head.
Roast in the preheated oven for 35 to 40 minutes, until the chicken reaches an internal temperature of 165°F (74°C) and juices run clear.
Remove from the oven, sprinkle the chopped fresh oregano over the chicken, and serve.