Costco Bakery inside the La Mesa warehouse at 8125 Fletcher Parkway produces large-format baked goods scaled for bulk purchasing, from 48-count croissant flats to half-sheet celebration cakes. The bakery department bakes all items on-site using commercial deck ovens and spiral mixers, a high-volume scratch operation whose party-tray output overlaps with catering kitchens like J-K's Greek Cafe serving the La Mesa event circuit. Costco's Kirkland Signature label governs ingredient sourcing across the bakery's product line, including the high-protein bread flour used in its artisan round loaves and the high-butterfat laminated dough for its croissants. The Fletcher Parkway warehouse sits in the same Grossmont grocery corridor as supermarket bakeries at Vons, though Costco's membership model concentrates output on fewer SKUs at higher per-unit volume. The department's sheet cakes use a white or chocolate sponge base with buttercream or whipped icing, finished with custom piped lettering and available in half-sheet and full-sheet formats that serve 24 to 48 portions.