Feels Like Constant Cctv Camera On Me-judging And Commenting

Force yourself to ignore them. They are waiting for your reaction. Just go and do your work and go back. Once they see they can’t get a rise out of you they will reduce this behavior.

 

This is the problem. But unfortunately, their position as parents in law in the house, and your husband's silence towards them it is less likely that this problem will get resolved anytime soon.

However, the problem should not make you so uncomfortable to alter your life style this way.
Look, the real problem is not them acting as a CCTV in the home, but your reaction towards their action.

You can't control their actions, but definitely you can control your reaction towards it.

The next time when they stare at you, or follow you to the kitchen, you may chose one of these reactions depending on your comfort level:

1) Stare back at them with puzzled eyes and ask what? be polite, but firm as if you are concerned and trying to help them. Do this repeatedly?
What ma? do you want anything? are you here to ask anything from me? may I help you?
Pause and wait for their response. Don't do anything until they give you an answer, but keep staring at them. This will make them uncomfortable.

2) Give it back nicely, sarcastically yet in a humble and polite tone. This is something you should practice before the mirror before trying. Not easy, I warn you.
If they comment in a judgmental way or demand you to cook/do things differently, then you should give them the spatula and ask them to show it themselves as you know nothing about cooking. Repeat each time they comment negatively.
"Sorry ma... I am so dump that I don't even know how to cut veggies. Could you please cut them for me". don't wait for their response. Just move and do something else. Don't pay any attention to their response, but pretend as if you are busy with some other task. Perhaps pretend to speak to someone on phone etc...
Then come back to the task, and ask "ma, didn't you chop the veggies as you wanted? , ok no issues, let me chop as much as I know. Sorry ma, please bear with my cooking" and leave the place with puppy eyes. The evil (whoever it is) will know the evilness in your eyes. But for the rest, it should stay innocent.

3) Buy some wireless earphones, connect them to your phone and listen to some great music to the point that your mind forgets what's going on in the outside. Just go to kitchen, concentrate on your cooking while also singling or enjoying the music. Even if you heard them commenting, you can always pretend as if you did not hear them. Simple and most effective way of ignoring nosy inlaws