Blogspot blogs do have a RSS feed url by default & you don’t need to use FeedBurner type of feed management tool to create a new one. Previously Blogger blog used to have only atom feed. That format still exists. But Google Blogger also introduced RSS feed format that is readily available.
Just replace domain with your blogspot or custom domain name below & you will have your RSS feed.
http://blog-name.blogspot.com/feeds/posts/default?alt=rss