Spray a rimmed baking sheet with cooking spray and preheat oven to 400 degrees. Arrange chicken and veggies in a single layer on the prepared sheet pan.
Drizzle chicken and vegetables with olive oil and lemon juice, season with garlic and spices, and toss gently to coat. Add lemon slices on top of the veggies.
Roast chicken and veggies at 400 degrees for 45 minutes or until chicken is to temperature and potatoes are soft, rotating pan, flipping drumsticks over, and stirring veggies halfway through.
Serve your Greek chicken drumsticks & veggies topped with crumbled feta (optional).
Notes
Cut the potatoes smaller and the bell pepper larger so that they cook more evenly. This recipe comes out pretty lemon-y, which we enjoyed -- but if you're concerned it will overwhelm your palate, either just cut down on the lemon juice a little or use one lemon total.