She ate all the biscuits

Utter bullshit. OP is not screwed up for limiting junk food and not letting a 7 year old eat a whole packet of biscuits.

I would be cross. She knew they were for others and that they'd been hidden deliberately. She still hunted and ate them all. Greedy and selfish. I do wonder if she has a problem though. That sort of behaviour is like that of an addict. I would try to nip that in the bud somehow. Also kids like that eventually are able to go buy food at school and out and about. They then go mad on all the stuff they didn't have freely at home.

Right so then what experience do you have that limiting it will give OPs daughter a medical disorder? You have only experienced children who can self limit and who you have not limited. So you have no idea what the opposite would do.

No it isn’t. I’ve raised two healthy and athletic children. If they are hungry or want a snack they can eat without fear or guilt or having to hide anything.

Oh really. What are your qualifications to pronounce this?

I think binge eating of junk food is something to be concerned about as it goes. It would suggest a strong appetite and an inability to eat sweet, processed foods in moderation. I would be concerned as to what that might look like when she is older and has pocket money. All of that would make me less inclined to have that food in the house and much more inclined to have plentiful amounts of alternative foods that she could eat a good portion of.

Don’t be ridiculous. Limiting a child’s access to food that is unhealthy is a parent’s job. Some kids never learn to self moderate even if given free reign.

No, it’s naughty behaviour.

OP you haven’t failed because she can’t control herself. She does need consistent boundaries but some children (and adults) struggle with self control more than others. Some have ADHD and others don’t. I gave some advice further up the thread but honestly just set the boundaries for her until she is mature enough to make them herself. Not all children are the same, I have one who would raid the cupboards until they vomited at any given opportunity and two who like sweet treats but will happily stop halfway through a cookie if they are full. Deal with the child you have. No shame or guilt just boundaries. You wouldn’t let her raid the booze cupboard or drive the car. So you limit her intake (not extremely) until she can limit it herself. I assume she tells you if she’s hungry??

Isn't that because they are never in the house? If you make things off limits when they are available it's going to be harder for her to resist not wanting to eat as many as she can as she doesn't know when she'll get them again

Keep on - your daughter will soon develope an eating disorder. What you’re doing is incredibly screwed up.

We have a snack drawer and my DDs know where it is but always ask me if they can have a snack before they take one. I’d usually say yes or at least offer a fruit alternative but then they don’t ask all the time. If they were sneaking food without asking I would wonder what was going wrong and have a chat.

Craving sugar is an early sign of diabetes. I once ate an entire pavlova before my diagnosis. It may be worth getting this checker out just to be on the safe side.

It sounds like she's developed a bit of a sugar/UPF addiction and I'd cut it completely for a week or two. I once had the same problem and when I was waking up in the night and eating tablespoons of golden syrup I decided it had to stop and cut all (artificial) sugary snacks and drinks (including alcohol) for a month. The main thing I noticed was how I started to really taste the sweetness of fruit. After the month was over I bought a raspberry muffin and it tasted so overwhelmingly sickly sweet that I only had one bite.

Id be furious. They were put away and she deliberately looked through the cupboards until she found them and ate them all.

There would be a stern talking to about fair shares and making sure everyone in the family can enjoy a treat, not just one person hogging it all.

If she's just craving sugar, have you had her checked for diabetes? I'm type 2, and my main symptom when it's not under control is wanting nothing but sweet things

The issue is: why can’t she control herself? 7 is plenty old enough to understand that just because you want something it doesn’t mean you can have it. This is what you need to work on. Not hiding food - getting her to learn self control.

In the future, since you know she has a sweet tooth, you could set aside a small amount of the chocolate on a plate for her at the very start and tell her she can nibble on that while you're both baking but clearly explain the rest of the chocolate and other ingredients are off limits as they're needed for baking. If she eats her allocated amount and then also tries to eat the chocolate for the cake you can then impose consequences for ignoring you

I agree with @WiddlinDiddlin , I would have stopped baking as well since she ignored a clear instruction not to eat the ingredients needed.
If you told her to stop doing something but she continued anyway then there should be a consequence of some sort, so she learns that if she ignores mum or dad then she loses out.

I'm wondering, based on your posts, if this is more to do with her having become used to ignoring you because she thinks there won't be any consequences? I'm interested too in what you did/said after she continued to eat the ingredients even though you told her not to.

I genuinely think you should ask the gp or something. I don't really know who but I really don't think it's normal. Its either misbehaviour or like an addiction. Or maybe there's an issue somewhere like an underactive thyroid. I don't know. But it's not normal to always have an uncontrollable need to eat everything