The simple answer is, having a subdomain does not negativity affect your Google ranking.
In fact, we take care to add rich recipe snippet data, fast loading speed and other factors to make your recipe website perform really well on Google.
"Sure, sure, but where's your proof?"
John Mueller, Webmaster Trends Analyst at Google, has been asked this before and his answer is clear:
"[Your raking is not hurt by use of subdomains, in general...] we recognize that some sites use subdomains as different parts of the site in the same way that other sites user sub-directories..."
Setting up a recipe subdomain
To setup a recipe subdomain, follow our helpful guide here.