Pre-heat oven to 400ºF.
In a small bowl mix together dill, parsley, garlic powder, onion powder, sea salt, black pepper.
1 teaspoon dried dill, 1 teaspoon dried parsley, 1 teaspoon garlic powder, 1 teaspoon onion powder, 1/2 teaspoon fine sea salt, 1/2 teaspoon ground black pepper
In another small bowl mix together mayo, almond milk, scallions. Add 1/2 of the ranch spice mixture and combine. Set aside.
1 cup good-quality mayonnaise, 2 scallions, 1/4 cup unsweetened almond milk
In a large bowl combine red onion, sweet potato, red pepper, broccoli, avocado oil and remaining 1/2 of the ranch seasoning. Pour onto rimmed baking sheet and bake for 20 minutes.
1 medium red onion, 1 medium Japanese sweet potato, 1 red bell pepper, 2 cups broccoli florets, 2 tablespoons avocado oil
Meanwhile place chicken breasts into the large bowl used for the vegetables and add 1/3 cup of the ranch dressing. Toss to combine and place in refrigerator to marinate while vegetables are baking.
1-1/2 pounds boneless
After 20 minutes take out sheet pan and move vegetables to the sides to make space for the chicken. Place the chicken breasts in the middle of the pan and pour over any reserved marinade.
Continue to bake for 25 minutes, or until chicken is fully cooked through.
Remove from oven and serve hot drizzled with remaining ranch dressing.