Coat a large nonstick skillet with cooking spray and set it over medium-high heat. When the skillet is hot, add the oil. Add the onion and cook, stirring occasionally, 7 to 10 minutes. Add the celery and cook 3 to 4 minutes longer. Scrape the mixture into the bowl with the breadcrumbs. Add the beef, Parmesan, carrot puree, ketchup, salt, and pepper, and stir to combine.
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