I absolutely can't comprehend this. Your kids are the same age as my little ones. How do you find all this time to bake? I can't even get dinner on the table each night without becoming a frazzled mess because Clara attaches herself to my leg. I am in awe.
It is indeed the case that I spent much of the weekend holding Sarah in one arm while dumping ingredients into bowls with the free hand. But the best thing to do with roving children while trying to get something done is - put them to work*.
*Children are gross, don't put them to work without first subjecting them to lots and lots of soap and water.