Substitute for quinoa

Need more detail -- for cookies, is the quinoa precooked? or quinoa flour? or uncooked quinoa seed for crunch? Sometimes, if the ingredient is not necessary to the structure of what you're making, you can leave it out.

A new grain that compares to quinoa is Amaranth, it is a complete protein on its own and it cooks almost the same as quinoa, try it and I know you'll enjoy it

Quinoa and couscous are totally different creatures. Quinoa is a seed and couscous is a pasta. But how do you plan to use it???

If you aren't using it for a gluten free recipe bulgar or cous cous will work just fine