Greek Stuffed Peppers

Preheat oven to 350º. Slice off the top of each bell pepper. Discard stems and remove ribs and seeds from peppers. Place peppers upright in a large casserole dish. In a large skillet over medium heat, heat oil. Add chicken and season with oregano, salt and pepper. Cook until chicken is golden and no longer pink, 8 minutes per side. Transfer to a cutting board and let rest 5 minutes, then dice. In a medium saucepan over medium-high heat, add 1 cup chicken stock. Bring to a boil then remove pan from heat. Stir in couscous then cover the pan with a tight-forming lid until the couscous is tender and all of the liquid has been absorbed, about 5 minutes. In a large bowl, combine cooked couscous, red onion, garlic, 1/2 cup feta, and zucchini. Season mixture with salt and pepper. Stuff couscous mixture into peppers and sprinkle tops with remaining 1/2 cup feta. Pour remaining 1/2 cup chicken broth into baking dish (to help the peppers steam) and cover with foil. Bake until peppers are tender and the cheese is melty, 42 to 45 minutes. Squeeze lemon juice over cooked peppers and serve immediately.