Preheat the oven to 400°F

Mix lemon zest, lemon juice, olive oil, garlic, oregano, salt, and ground pepper together.

Grease bottom of a 9x13 pan. Place chicken breasts in pan and spread half of the lemon dressing mixture over the chicken breasts.

Cut up vegetables and mix with remaining lemon dressing mixture. Pour vegetables around chicken and bake at 400°F Fahrenheit for 1 hour. Check halfway through cooking time and stir vegetables to make sure they cook evenly.