Утром мне хватило кефира и батона, а брат снова попросил омлет без ветчины.

Утром means in the morning or this morning, depending on context.

Formally, it is the instrumental case of утро (morning), but in expressions of time, Russian often uses old instrumental forms adverbially. So утром functions like an adverb of time.

Similar examples:

• днём — in the daytime
• вечером — in the evening
• ночью — at night

So you do not need to think of it as a normal object in the instrumental here; it is simply a standard time expression.

Because хватить / хватать in this meaning works differently from English to have enough.

Russian uses an impersonal construction:

• мне хватило = it was enough for me
• literally: to me, it sufficed

So:

• мне is in the dative case and marks the person affected
• хватило is neuter singular past tense, used impersonally

More examples:

• Мне хватило времени. — I had enough time.
• Ему не хватает денег. — He does not have enough money.
• Нам хватит. — That will be enough for us.

So the person who experiences sufficiency is usually in the dative, not the nominative.

After хватило / хватит / хватает, the thing that is enough is very often put in the genitive.

So:

• кефир → кефира
• батон → батона

This is common with words involving quantity, sufficiency, absence, and similar ideas.

Compare:

• Мне хватило воды. — I had enough water.
• Нам не хватает сахара. — We do not have enough sugar.
• Ему хватит терпения. — He will have enough patience.

With food items especially, the genitive can also feel a bit like some or enough of that thing.

Not exactly.

Батон usually means a long loaf of white bread, something like a standard Russian loaf, often closer to a soft baguette-shaped loaf than to generic bread.

So it is more specific than хлеб:

• хлеб = bread in general
• батон = a loaf of white bread of a particular common type

This is a cultural vocabulary item, and learners often notice that it does not map perfectly onto one single English word.

Russian often omits possessives like my, your, his, etc. when the meaning is obvious from context.

So:

• брат can mean the brother, my brother, his brother, etc., depending on context
• if needed, Russian can say мой брат, but it often sounds unnecessary if the relationship is already clear

This is very normal in Russian. English usually needs to specify more.

Попросил is the perfective past of просить.

Here the perfective is used because it refers to one completed request:

• he asked once
• the action is presented as a whole event

Compare:

• просил — was asking / asked repeatedly / used to ask
• попросил — asked once, as a completed act

So in this sentence, брат снова попросил means he again made the request, not that he was in the middle of asking.

Because омлет is the direct object of попросил, so it is in the accusative case.

But for an inanimate masculine singular noun, the accusative looks the same as the nominative.

So:

• nominative: омлет
• accusative: омлет

Compare with an animate masculine noun:

• Я вижу брата. — accusative changes
• Я вижу омлет. — accusative stays the same

So the case is accusative, even though the form does not change.

Because the preposition без always takes the genitive case.

So:

• ветчина → ветчины

This is one of the standard preposition + case patterns you simply need to learn:

• без сахара — without sugar
• без молока — without milk
• без ветчины — without ham

So the change is not caused by омлет; it is caused by без.

Yes, опять could also be used here.

Both снова and опять often mean again. In many sentences they are interchangeable.

Very roughly:

• снова can sound a bit more neutral
• опять can sometimes sound a bit more conversational, and in some contexts can suggest annoyance: again!

But this is only a tendency, not a strict rule.

So:

• брат снова попросил = perfectly natural
• брат опять попросил = also natural, possibly with a slightly stronger feeling of repetition

Yes, Russian word order is flexible, but the chosen order sounds natural and helps organize the information.

Current sentence:

• Утром мне хватило кефира и батона, а брат снова попросил омлет без ветчины.

This order does a few things:

• Утром sets the time first
• мне highlights the experiencer early
• а introduces a contrast or shift to the brother
• снова sits near the verb and emphasizes repetition

Russian word order often reflects information structure rather than a fixed grammatical pattern.

Possible variations:

• Мне утром хватило кефира и батона...
• Брат снова попросил без ветчины омлет... — grammatically possible, but less natural here
• Утром кефира и батона мне хватило... — more marked, with stronger emphasis on the food

So the original order is not the only possible one, but it is a very normal, smooth way to say it.

Not exactly.

А often connects two clauses, but it usually suggests some kind of contrast, comparison, or shift of topic, rather than simple addition.

Here it is something like:

• as for the brother
• while my brother
• and meanwhile my brother
• but my brother, depending on tone

So:

• first clause: what was enough for the speaker
• second clause: what the brother asked for

If Russian wanted a plain linking and, it might use и, but а is better here because the sentence is contrasting two different people and their food situations.