I figured it out:
On a new page include the following code (XWiki 1.0 syntax) and
replace the string passed to getDocument with the space.page
containing you blog posts:
#includeMacros("Blog.RssCode")
##
##
##
#set ($blogDoc = $xwiki.getDocument("Marketing.Marketing-Blog"))
##getTargetBlog($blogDoc)
#getBlogEntries($blogDoc $entries)
#set($entries = $xwiki.wrapDocs($entries))
#displayBlogRss($blogDoc $entries)
Best regards
Philipp