Preheat the grill to medium-high heat, about 450˚F.
In a small bowl, stir together butter, salt, chili powder, smoked paprika, ground cumin, black pepper, garlic powder, and onion powder. Brush the butter mixture over the corn. Reserve the excess and set aside for later.
Add the corn cobs to the grill. Grill, turning often, until the corn is tender and charred, about 10 to 12 minutes. I find that I like just a touch of char, but you can leave the corn on longer for more char than pictured if you prefer.
Remove corn from grill and brush with leftover butter. Sprinkle with chives.*
Serve warm with lime wedges.
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notes
*You can also serve this corn as a salad! Remove corn kernels from the cobs and add to a bowl. Drizzle over reserved butter and chives. Stir to combine and serve with lime wedges.