Blossom - Category Index Setup
Navigate to Pages > Add New.
Give your new page a name. Something like Recipes, Index, or something that fits your site.
On the right under the Page Attributes panel, you’ll see the Template drop down.
Select Category Index from the drop down.
Publish the page.
Then add Genesis – Featured Posts widgets under Appearance > Widgets > Category Index.
And a further breakdown of how these are set up: