Hi everyone -
Google provides a tool that will allow you test whether everything is set up properly on your blog. You can find it here:
Enter an example post url in the box and it will show you all the microformats that it found. Make sure you scroll down to the schema.org section since that is what Recipe Card uses.
At the very top, you'll also see a preview of how that page will appear in search results.
Please keep in mind that even if everything is set up properly, it can take a while for Google to reindex your page. As bakeologybylisa pointed out, this can take a while, but you can use google's webmaster tools to tell Google to reindex the page.
I hope that helps. If you're still having trouble, please send an example page that isn't working to email@example.com.