First you must have your Cooked plugin active. Head over to your WordPress admin, and navigate to Recipes > Settings. Once you’re there, click on the last tab which says Permalinks. Make sure your recipe permalink is different that your recipe archive permalink. For example, if your recipe archive page is called Recipes, you should change your recipe permalink to recipe. This is just an example, the whole point is that the recipe permalink should not be the same as the recipe archive permalink.
Once you’re done, make sure you reset your permalinks. A guide on how to do that can be found here