Preheat oven to 425 F.
Place chicken in a large bowl. Drizzle with lemon juice, and sprinkle with 1/2 teaspoon salt, poultry seasoning, 1/2 teaspoon garlic powder, and black pepper; toss to combine.
Place eggs in a shallow dish. Beat lightly. Combine panko, Parmesan, oregano, and parsley in another shallow dish. Dip each drumstick in eggs then dredge in panko mixture. Place drumsticks on a rimmed baking sheet coated with cooking spray; discard remaining egg and panko mixture. Coat tops of drumsticks with cooking spray. Bake for 15 minutes.
Meanwhile, cut sweet potatoes into 8 wedges and toss with 1 tablespoon oil, remaining 1/2 teaspoon garlic powder, paprika, chili powder, and 1/2 teaspoon salt. Arrange potatoes on one half of another rimmed baking sheet coated with cooking spray. Place in oven with chicken, and bake for 10 minutes.
Combine broccoli, remaining 1 tablespoon oil, crushed garlic clove, and remaining 1/4 teaspoon salt. Remove baking sheet with potatoes from oven; turn potatoes over, and add broccoli to other half of pan. Place in oven with chicken, and bake for 20 minutes or until chicken and potatoes are done. Squeeze 1 lemon wedge over broccoli.
Serve remaining lemon wedges with meal along with grapes on the side.