Forget crappy store-bought veggie burgers. These are delicious. I used about 1 cup of sweet potato with 1 cup of cooked quinoa and 1 egg, which made 4 small-ish patties. Scale up accordingly.
To cook quinoa, rinse well and then add 1 part quinoa to 1.5 parts water in a pot. Bring to a simmer, lower the heat, cover, and cook until water is absorbed (about 15 minutes). Almost every other quinoa recipe I see says 2 - 3 parts water and it’s why I hated quinoa for so long — it turns to mush! Less water will give you fluffy quinoa every time.
Taking out the breadcrumbs and substituting it for Chickpea flour will make this Gluten free! Totally trying this.