Visually it all looks the same. Though, when weighed, it's not all the same. Today's measurements with a digital kitchen scale (100% humidity outside):
1 cup of all-purpose flour =
Sample | Scoop+Level | Spoon+Level | ||
1 | 153 g | 139 g | ||
2 | 149 g | 129 g | ||
3 | 156 g | 136 g |
I have noticed over the years that when making cookies, I often have a lot more flour leftover in the mixing bowl; though this was more prevalent in southern California where the air is dry nearly year-round.
But, when looking at online recipes by others, the dry ingredient units vary--even from the same author.
AB | measure | suspected | ||
sugar cookies | 3 cups AP flour | volume | ||
oatmeal cookies | 16 oz old fashioned rolled oats | weight | ||
lentil cookies | 9.5 oz whole wheat pastry flour (about 2 c flour) | weight | ||
vanilla wafers | 7 oz AP flour | weight |