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Preheat a well-oiled grill to medium-high heat. (TIP: If using a grill pan, you’ll heat it in step 6.) Wash and dry produce.
Drain corn, then pat dry with paper towels. Halve and peel onion; thinly slice one half (whole onion for 4 servings). Finely chop remaining onion. Dice tomato into 1⁄2-inch pieces. Trim and thinly slice scallions.
Slice bacon crosswise into 1⁄2-inch pieces. Pat chicken dry with paper towels; season all over with half the BBQ seasoning, half the paprika, salt, and pepper.