Step 1Heat the oven to 350 degrees. Season the chicken legs well on all sides with 1 1/2 teaspoons salt and 1 teaspoon pepper.
Step 2In a Dutch oven or large stockpot, heat the olive oil over medium-high heat. Working in batches, brown the legs well on all sides, about 5 minutes. Remove from the pan.
Step 3Add the orzo, chicken stock, garlic, lemon wedges and juice, olives, bay leaf and 1 tablespoon of the oregano. Stir to combine all the ingredients, then return the chicken to the pan. Cover and transfer to the oven. Bake for 25 to 30 minutes, until the chicken is done (the meat will be firm and its juices will run clear). Taste and adjust the seasoning if necessary, sprinkle with the remaining oregano and serve.