You don't need to break how you feel from the inside to your inlaws, only do that to your hubby!
Why don't you just be like, "don't worry I have it under control, so why don't you teach me how to cook ______ today!" This was they feel like you are doing your best to be a good DIL, but at the same time, you won't need them to keep on bossing you around. Not only that, if you ask, your Saas will feel needed, and special.
Hun this is your time to make a place in their heart, not only that but make a place in the family. Believe me i'm all up for a baho to be Saas free, and independent and all, but at the same time you have to please your family too. Do things before they even can think of saying something to you. You don't need to slave around or anything, but do things which will touch each and every persons heart in your inlaws, small things. These little things matter for later. Work hard to set your place in the family now, so you won't have to hear it later. All saas are crazzy from time to time, but its your job to be even better then her own daughters. And at the stupid things they say like, wasting your hubby's money, just ignore and say jee! Who cares, all you need to do is make a good impression, and move on!
Now as for your hubby, tell him to shut it! You are not a child, and he should do his job and let you do yours! Do you ever butt in his work, prolly not, so he needs to keep his comments out, and let you handle your inlaws the way you want too!
Hope that helps!!! Good luck:)