Hi Clare,
Thanks for your question!  I am not aware of a good way to do this currently.
My first thought was “All Recipes”, a website where you can upload recipes or favorite other people’s recipes. I know it has an Alexa Skill – however, based on the reviews I read, it’s a terrible experience that does not work properly. I don’t feel comfortable recommending it based on the reviewers being unable to accomplish exactly what you are asking for.
My second idea would be to use Amazon Photos to accomplish this. You could save your recipe as an image (or take a screenshot) and upload it to Amazon Photos in a folder called “recipes” then view them that way. This is not a great solution, though.
Hopefully Amazon adds this functionality soon! And maybe some of our community members have ideas for another way to accomplish this?
-Daniel

If they could just accept ‘Copy Me That” you can store your recipes there and recipes from other online sources. I don’t know how they could but anything other than only Allrecipes and Kitchen would be an improvement.

I’ve mentioned Anylist before as a great list app to replace Alexa’s built in list app. It also has a brilliant recipe feature, allowing you to import recipes from web sites (with a browser extension – available for most common browsers) Or to create your own. For Paper recipes, as Daniel suggests, photograph them and add the phot to the recipe card in Anylist