gluten-free eats

I do have a question. I have what seems like it should be a really really really good and tasty recipe for hazelnut sugar cookies, but it only gives the ingredients. I can figure out how to assemble the ingredients to make the batter, but there is nothing about how long to bake them or at what temperature. Weird and annoying... (It does mention wheat flour, but I can just sub in some GF flour blend or other.) Any thoughts on temperature or timing?

https://www.bonappetit.com/recipe/hazelnut-sugar-cookies