Bu kadar gevrek böreği görünce yemeden edemiyorum.

Here bu kadar means this much / to this degree / so.

Because it comes before the adjective gevrek, it is talking about the degree of crispiness, not the amount of börek.

So:

• bu kadar gevrek = this crispy / so crispy
• bu kadar börek would mean this much börek / this many pastries

In this sentence, bu kadar gevrek böreği is roughly a börek this crispy or such a crispy börek.

Because böreği is the direct object of görünce (when I see), and Turkish often marks a specific direct object with the accusative ending -(y)ı / -(y)i / -(y)u / -(y)ü.

So:

• börek görünce = when I see börek in a more general sense
• böreği görünce = when I see the/that specific börek

English uses articles like a and the, but Turkish often shows this kind of distinction with case endings instead.

This is a very common Turkish sound change.

Many Turkish words ending in p, ç, t, k soften when a vowel-initial suffix is added. So:

• börek
  • -i → böreği
• not böreki

This kind of change is also seen in:

• kitap → kitabı
• ağaç → ağacı
• kanat → kanadı

So the ending is still the accusative -i; the stem changes slightly when the suffix is added.

Görünce comes from görmek (to see) plus the suffix -ınca / -ince / -unca / -ünce, which usually means when, once, or upon doing something.

So:

• görmek = to see
• görünce = when seeing / when I see / upon seeing

This suffix is very common in Turkish:

• gelince = when he/she/it comes
• bitirince = when he/she/it finishes
• duyunca = when he/she/it hears

By itself, görünce does not explicitly say who the subject is.

In sentences like this, the subject is usually understood from the main verb and from context. Since the main verb is edemiyorum, which is first person singular (I can’t), the natural reading is:

• görünce = when I see

So the sentence is understood as:

• When I see a börek this crispy, I can’t help eating it.

This is a very important Turkish pattern.

Verb + -meden/-madan edememek means:

• to be unable not to do something
• more naturally in English: to can’t help doing something
• or to can’t resist doing something

So:

• yemeden edemiyorum = I can’t help eating it
• literally, something like I can’t manage without eating

Other examples:

• Gülmeden edemiyorum. = I can’t help laughing.
• Bakmadan edemedi. = He/She couldn’t help looking.

Because -meden / -madan means without doing.

So:

• yemeden = without eating

But the whole structure yemeden edemiyorum is idiomatic. It does not mean a simple negative like I don’t eat. Instead, it means:

• I can’t refrain from eating
• I can’t help eating

So the negative part is part of the pattern, not a contradiction.

In -meden edememek, etmek is part of a fixed idiomatic construction. It does not keep its full ordinary meaning of to do.

So you should learn Verb + -meden edememek as a chunk:

• yemeden edememek = to be unable to resist eating
• sormadan edememek = to be unable to stop oneself from asking
• düşünmeden edememek = to be unable not to think about it

This is one of those structures that is best understood as a set expression rather than translated word by word.

Because Turkish often leaves out subject pronouns when the verb already makes the subject clear.

Edemiyorum already tells you the subject is I.

So:

• edemiyorum = I can’t
• ben is not necessary

If ben were added, it would usually give extra emphasis:

• Ben ... edemiyorum. = I can’t help it / I just can’t resist

It is in the -iyor form, often called the present continuous.

But in Turkish, this form can also express a more general or habitual meaning, not only something happening right this second.

So here edemiyorum can mean:

• I can’t help eating it in general
• Whenever I see it, I can’t resist
• and depending on context, it can also feel quite immediate

So even though the form is technically present continuous, the meaning in English is often broader than a strict am doing form.

Grammatically, böreği is singular.

However, Turkish does not use articles the same way English does, so depending on context you might translate it as:

• the börek
• that börek
• a börek this crispy

What matters most here is that it is being treated as a specific object, not as börek in general.

Yes, that is possible.

A phrase like bu kadar gevrek bir börek means a börek this crispy / such a crispy börek and sounds very natural too.

The difference is mainly about specificity:

• bu kadar gevrek bir börek = a börek this crispy; less specific, more like one example of such a thing
• bu kadar gevrek böreği = a more specific object, especially because of the accusative ending

So the sentence you were given is not wrong; it just presents the börek as something more definite or specifically in view.

Turkish word order is flexible, but the given order is very natural.

The sentence is arranged roughly like this:

• Bu kadar gevrek böreği = the thing being talked about
• görünce = when I see it
• yemeden edemiyorum = I can’t help eating it

Turkish often puts the main verb at the end, and that is exactly what happens here.

Starting with Bu kadar gevrek böreği gives strong emphasis to the tempting object itself. In other words, the sentence begins by highlighting the thing that causes the reaction.