Antoni Porowski’s Chile-Maple Roast Chicken

Name: Antoni Porowski’s Chile-Maple Roast Chicken
Cuisine: American, Latin American, TexMex
Ingredients: 4 tablespoons (½ stick) unsalted butter, at room temperature; 2 tablespoons pure maple syrup; 2 teaspoons chili powder; 2 teaspoons ground dried chipotle chile (or ¼ teaspoon cayenne pepper); One 4½- to 5-pound whole chicken; Kosher salt; ½ lemon; ½ small onion, unpeeled, cut into wedges; 5 garlic cloves, gently smashed but not peeled; Freshly ground black pepper