Preheat the oven to 400° F and spray a deep baking dish with non-stick cooking spray or line with tin foil.
Place the chicken top-side down in the baking dish and brush surface evenly with 1 Tbsp melted butter; sprinkle with half of the Everything Bagel seasoning.
Flip the chicken over, brush with remaining melted butter, and sprinkle with remaining Everything Bagel seasoning. Evenly distribute about half of the sliced green onions over top.
Place in oven and bake at 400° F for 30-40 minutes or until chicken is cooked through and internal temp reached 165° F.
Remove from oven, sprinkle with remaining green onions, spoon sauce over top, and let cool for 5 minutes before serving.
Sauce
Add all sauce ingredients into a bowl and whisk until thoroughly combined. Season with sat and pepper to taste and whisk again.