Useful Tips 1. To best butter temperature is to test by pressing the butter with your thumb. It should leave a thumb print but not all the way down. Level of softness determines if you are making or breaking the cookies. Butter which is too soft will cause the dough to be too soft to shape and eventually spread apart when baking. 2. The consistency of the cookie dough should be soft but yet solid enough to be formed into cookie balls. 3. Cookies made with whey protein powder will over baked easily and becomes too dry as a result. Therefore, depending on your oven, it only takes about 5 min at 170°C for my oven to get a brownie consistency which retains the softness and moisture I love inside the cookies. Another minute or so can already harden the cookies too much. It will still be delicious but texture wise will not so much resemble brownies. The doneness of cookies should still be a little bit undercooked and soft to touch. A minute of difference can already dry out the cookies so watch closely during baking. 4. Oat fiber is naturally gluten free. However, the worry could be due to how oat fiber is manufactured if the same production environment is also producing other non-gluten free products. Do look for certified gluten-free oat fiber if gluten is a concern.