I've read many recipes asking to mix sugar and butter at medium speed for about 5 minutes. Can I use slower speed and mix it a little bit longer? Will it make any different in the end?
One more thing, when mixing dry ingredients into wet ingredients, does it really make a difference if I use hand mixer instead of a spatula? In the videos, I've seen most of the bakers usually switching to spatula when they have to mix wet and dry ingredients together but some of them mix them in a stand mixer.