The safest and most straightforward way to get Overcooked 2 on your Nintendo Switch is through the official Nintendo eShop.
Alternatively, if you're looking for a specific DLC link, I couldn't find any direct links. However, you can try searching for "Overcooked 2 DLC" on the Nintendo eShop or on a search engine to find more information.
Conclusion
Step 4: Install the DLC.
One by one, drag each DLC .nsp file into the installer. Order does not matter, but ensure they all finish before rebooting. For Night of the Hangry Horde, verify the file size is at least 150 MB—smaller files are usually just unlock keys (fraudulent).
When you finally find a verified Overcooked 2 Switch NSP update DLC link on forums like r/SwitchPirates or GBAtemp, ensure the pack contains the following specific files: overcooked 2 switch nsp update dlc link
DLC Link
Automatic Updates: Enable this by going to System Settings > System > Auto-Update Software. Purchasing and Updating Overcooked 2 on the Nintendo
The best way to enjoy Overcooked 2 and its DLC on the Nintendo Switch is through the official Nintendo eShop. Not only does this support the developers, but it also ensures that you're getting a safe and legitimate copy of the game.
If you own a physical copy, you can dump your own Switch cartridge (requires a hacked Switch and open-source tools) to create a legitimate NSP backup for play on PC emulators. This is legal in some regions as a “personal backup,” though Nintendo disputes it. Conclusion Step 4: Install the DLC