Spiced Salmon With Potatoes and Corn

Name: Spiced Salmon With Potatoes and Corn
Ingredients: 12 Tbsp. unsalted butter, melted; ⅓ cup finely chopped garlic; 3 Tbsp. Old Bay seasoning; 2 Tbsp. garlic powder; 1 Tbsp. onion powder; 1 Tbsp. paprika; 1 tsp. sugar; 1 lb. baby potatoes, halved; 2 tsp. extra-virgin olive oil; 3 ears of corn, husked; 1½ lb. skin-on salmon fillet, cut into 4-wide pieces; 1 lemon, halved, divided; ½ medium red onion, thinly sliced; 1 bunch chives, cut into 3 pieces; ½ cup (packed) parsley leaves; Kosher salt