Если мне некогда готовить, я ем мюсли с йогуртом на завтрак.

Because некогда is used in an impersonal construction in Russian.

Russian often expresses ideas like I have no time, I am cold, I feel sorry, etc. without using a normal subject like я. Instead, it uses a person in the dative case:

• мне = to me / for me
• тебе = to you
• ему = to him

So:

• Мне некогда готовить literally feels like For me, there is no time to cook
• Natural English: I don’t have time to cook

That is why мне appears here instead of я.

Here некогда means there is no time or I don’t have time.

So:

• Мне некогда готовить = I don’t have time to cook

A learner should be careful, because некогда can also mean once / at one time / formerly in some contexts, but that is a different usage.

In this sentence, it clearly means no time.

A close synonym is:

• Мне нет времени готовить = I have no time to cook

But мне некогда is very common and natural in everyday speech.

Because after некогда, Russian normally uses an infinitive to say what there is no time to do.

Pattern:

• мне некогда + infinitive

Examples:

• Мне некогда читать = I don’t have time to read
• Ему некогда звонить = He doesn’t have time to call
• Нам некогда отдыхать = We don’t have time to rest

So:

• Мне некогда готовить = I don’t have time to cook

This is about aspect.

• готовить = imperfective
• приготовить = perfective

The imperfective готовить is used here because the sentence talks about cooking as a general activity, not about completing one specific dish one specific time.

So:

• Мне некогда готовить = I don’t have time to cook

If you said:

• Мне некогда приготовить ужин

that would mean something more like:

• I don’t have time to prepare dinner

That sounds more like one concrete completed task.

In your sentence, the speaker means cooking in general, so готовить is the natural choice.

Because Если мне некогда готовить is a subordinate clause introduced by если (if).

In Russian, clauses introduced by если are normally separated by a comma from the main clause.

So the structure is:

• Если мне некогда готовить, = If I don’t have time to cook,
• я ем мюсли с йогуртом на завтрак. = I eat muesli with yogurt for breakfast.

This comma is required in standard writing.

Because ем is the 1st person singular present tense of есть meaning to eat.

Conjugation:

• я ем = I eat
• ты ешь = you eat
• он/она ест = he/she eats
• мы едим = we eat
• вы едите = you eat
• они едят = they eat

A common beginner confusion is with еду, which comes from ехать and means I am going / traveling by transport.

So:

• я ем = I eat
• я еду = I’m going

Very different words.

Because the sentence describes a habitual or repeated action.

• Если мне некогда готовить, я ем мюсли с йогуртом на завтрак.
• If I don’t have time to cook, I eat muesli with yogurt for breakfast.

This is not about one single completed event. It is about what the speaker usually does in that situation.

For habits and general truths, Russian uses the imperfective:

• ем from есть

A perfective form would not fit this general repeated meaning.

Мюсли is a borrowed noun, and in modern Russian it is usually treated as indeclinable.

That means it often keeps the same form in different cases:

• Я ем мюсли
• У меня нет мюсли
• Я доволен мюсли
  (in real usage many speakers still keep the same form)

For a learner, the important point is that мюсли often stays мюсли.

In this sentence, it is the direct object of ем, so English speakers may expect a visible ending change, but there is none.

Because the preposition с meaning with normally takes the instrumental case when it expresses accompaniment.

So:

• йогурт = nominative
• с йогуртом = with yogurt

This is a very common pattern:

• с молоком = with milk
• с сыром = with cheese
• с другом = with a friend

So:

• мюсли с йогуртом = muesli with yogurt

A useful thing to remember is that с can take different cases in different meanings, but when it means with in the sense of accompaniment, it usually takes the instrumental.

Because на завтрак is the normal Russian way to say for breakfast.

So:

• Я ем мюсли на завтрак = I eat muesli for breakfast

This is a set pattern:

• на завтрак = for breakfast
• на обед = for lunch
• на ужин = for dinner

You may also see sentences with the meal word in another form in other structures, but after verbs like есть when you mean as a breakfast food / for breakfast, на завтрак is the standard choice.

Yes. Russian word order is fairly flexible, although each version has a slightly different emphasis.

The original sentence:

• Если мне некогда готовить, я ем мюсли с йогуртом на завтрак.

is very natural and neutral.

Other possible versions:

• Если мне некогда готовить, на завтрак я ем мюсли с йогуртом.
• Я ем мюсли с йогуртом на завтрак, если мне некогда готовить.

These all mean basically the same thing, but the focus shifts a little:

• putting на завтрак earlier can emphasize for breakfast
• putting the если clause later can make it sound a little more like an added condition

For learners, the original version is a good default.

Because Russian has no articles.

English says:

• I eat muesli with yogurt for breakfast

with or without an article depending on context, but Russian simply says:

• я ем мюсли с йогуртом на завтрак

Russian usually expresses definiteness from context, word order, or extra words if needed.

So the absence of a/the is completely normal.

Yes, если is the normal word for if in a conditional sentence like this.

So:

• Если мне некогда готовить... = If I don’t have time to cook...

It introduces the condition under which the main action happens.

This is one of the most important and common Russian conjunctions, so it is worth learning very early.