Hey guys im making brownies but i don't have a whisk. Can i substitute with a electric mixer on low switching on and off occasionally? Would that lead to overbeating the mixture
A mixer with whisk attachment is generally a good substitute for a whisk. Both are used to integrate air into a mixture or combine the ingredients. If the recipe calls for a whisk and I have non at hand, I simply use a mixer. Overbeating shouldn't be much of a problem, if you stop as soon as everything is combined/airy enough. In case I don't have a mixer, too, or it is just a very small amount, for which a mixer would be overkill, I simply use a fork. It is basically a very rudimentary whisk. It takes longer and is definitely more tedious, however, i even made meringue with a fork once (here it helps to add a little bit of salt and have the egg whites at room temp).
That said: For brownies a good spatula or spoon should work quite fine. No mixer needed.