As far as quality? Thomas Delauer and Sten Eckberg are two excellent sources (especially the latter one, as he has a more educational approach). Another one, Flavor City, has some keto recipes.
As far as "as much": don't forget that total calories still matter. But yes, if you're a "hard gainer", then you likely don,t eat enough for what you spend
it's 5:10 am and I'm hungry
:D