I don't have quinoa flour for a recipe that calls for 1/2 cup regular flour and 1/2 cup quinoa flour. Gluten free is not necessary.
I have regular flour and whole wheat flour, which should I use for the 1/2 cup quinoa flour?
I'd recommend just using regular flour. Since this is not a GF recipe, the quinoa flour is likely added for nutritional reasons, including increasing the protein content. If that is not a concern of yours, just use regular flour. Using whole wheat flour would give you a different flavor profile.