I assume you already know how to host a Garry's Mod dedicated server.

You can find the complete guide on Garry's Mod Wiki: https://wiki.facepunch.com/gmod/Downloading_a_Dedicated_Server

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There are multiple ways to use and install Super Cooking Panic on your dedicated server:

1. The easiest and recommended way to use and install Super Cooking Panic on your dedicated server is with the Steam Workshop.
2. Clone the Git repository. This is intended for developers only.
3. Using source code archive (zip/tar.gz). This is not recommended.

Steam Workshop

Setting up the Steam Workshop for your dedicated server is easy! Just follow the official guide: https://wiki.facepunch.com/gmod/Workshop_for_Dedicated_Servers

You just need to add the "Super Cooking Panic Gamemode Collection" in your server collection and let your server download the recommended addons (Garry's Mod will follow linked collections). You can also add the addons manually in your own Workshop collection.

Please note that some maps on the Steam Workshop may require CSS or other Source games, so don't forget to mount Source games in your server. Here is the full guide on mounting content: https://wiki.facepunch.com/gmod/Mounting_Content_on_a_Dedicated_Server

If your server is new and/or dedicated for Super Cooking Panic and doesn't have it's own Workshop collection. You can use directly the "Super Cooking Panic Server Content" with +host_workshop_collection 2180723989.

When you're ready you can just start your server with +gamemode supercookingpanic and any map.