NAICS Code
Killer Brownies most likely falls under NAICS code 311812, Commercial Bakeries. Use this to search in various databases for similar company financials.
Worth looking under 31135: Chocolate and Confectionery Manufacturing, but this does not usually apply to flour-based goods.
For point of reference: The Little Debbie Cosmic Brownie is manufactured by McKee Foods Corporation, which falls under the NAICS 311812.