Blank Site Template is missing in SharePoint 2013

 

First, there's still possible to create blank sites by using PowerShell:

1. Run the command Get-SPWebTemplate to get the full list of the available templates. You can see, the Blank Site template is still there, and it's ID is STS#1:
   
2. From this point, creating a new site collection is as easy as this:
   $template = Get-SPWebTemplate "STS#1"
   New-SPSite -Url "<URL for the new site collection>" -OwnerAlias "<domain\user>" -Template $template
   
   

Second, Just go to the folder C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\15\TEMPLATE\1033\XML, and open the WEBTEMP.XML file. There, you'll find a line like this:

<Configuration ID="1" Title="Blank Site" Hidden="TRUE" ImageUrl="/_layouts/15/images/stbs.png?rev=23" Description="A blank site for you to customize based on your requirements." DisplayCategory="Collaboration" AllowGlobalFeatureAssociations="False" > </Configuration>

Here you go: just change the highlighted tag from Hidden="TRUE" to Hidden="FALSE", save the file, and that's it: next time you want to create a new site, you'll get the Blank Site Template: