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Adjust rack to top position and preheat oven to 450 degrees. Wash and dry produce.
Heat a large dry pan over medium-high heat. Add bacon*; cook, turning occasionally and adjusting heat if browning too quickly, until crispy, 6-10 minutes. Turn off heat; transfer to a paper-towel-lined plate. Carefully discard all but 1 tsp bacon fat (2 tsp for 4 servings) from pan. (You’ll use this to cook the onion later.)
While bacon cooks, cut sweet potatoes into ½-inch-thick wedges. Halve, peel, and thinly slice onion.