Hoje eu quero comer um ovo no café da manhã.

Hoje means today, and putting it at the beginning is very natural in Portuguese when you want to set the time right away.

So Hoje eu quero comer um ovo no café da manhã feels like:

Today, I want to eat an egg for breakfast.

Portuguese word order is fairly flexible here. You could also hear:

Eu quero comer um ovo no café da manhã hoje.

That is also correct, but starting with Hoje gives today a little more emphasis.

It can often be dropped, because the verb form quero already tells you the subject is I.

So both of these are correct:

Hoje eu quero comer um ovo no café da manhã.
Hoje quero comer um ovo no café da manhã.

In Brazilian Portuguese, people often use subject pronouns more than in some other varieties of Portuguese, so eu sounds completely normal and natural.

After querer (to want), Portuguese normally uses an infinitive verb, just like English uses to + verb.

So:

• quero comer = I want to eat
• quero dormir = I want to sleep
• quero sair = I want to leave

Here:

• quero = I want
• comer = to eat

So quero comer literally works like want to eat.

Yes. Ovo is a masculine noun, so it uses um for an/a:

• um ovo = an egg
• o ovo = the egg

If it were feminine, you would use uma instead.

Examples:

• um livro = a book
• uma casa = a house

So ovo is masculine: um ovo.

Yes, but the meaning changes a little.

• comer um ovo = to eat an egg / one egg
• comer ovo = to eat egg / eat eggs in a more general sense

In your sentence, um ovo sounds like one specific serving: an egg.

If you say Hoje eu quero comer ovo no café da manhã, it sounds more general, like egg is the kind of food you want for breakfast, not necessarily emphasizing the number one.

It means at breakfast or for breakfast, depending on context.

The expression café da manhã is the normal Brazilian Portuguese way to say breakfast.

Literally, it comes from something like morning coffee, but as a whole phrase it simply means breakfast.

So:

• tomar café da manhã = to have breakfast
• no café da manhã = at breakfast / for breakfast

Because no is a contraction of em + o.

• em = in / at / on
• o = the
• em + o = no

This kind of contraction is required in normal Portuguese.

Other common ones:

• em + a = na
• de + o = do
• de + a = da

So:

• no café da manhã = at the breakfast / at breakfast
• café da manhã itself contains da, which is de + a

Because da is the contraction of de + a.

Historically and structurally:

• café = coffee
• da manhã = of the morning

So café da manhã literally looks like coffee of the morning, but you should learn it as a fixed expression meaning breakfast.

This is very common in Portuguese: some everyday expressions make more sense if you do not translate them word for word.

Yes, and the nuance is slightly different.

• no café da manhã = at breakfast / during breakfast
• para o café da manhã = for breakfast

So:

Hoje eu quero comer um ovo no café da manhã.
focuses on eating it at breakfast time.

Hoje eu quero comer um ovo para o café da manhã.
focuses more on the egg as the thing you want for breakfast.

In many situations, both are natural.

They are separate words, but they flow together in natural speech.

A Brazilian pronunciation is roughly:

um ovo → something like ũ-ô-vu

A few helpful points:

• um has a nasal sound; the m is not pronounced like a strong English m
• ovo in Brazilian Portuguese is usually pronounced roughly OH-voo or OH-vu, depending on accent
• When one word ends and the next begins with a vowel, Portuguese often links them smoothly

So in natural speech, um ovo may sound quite connected.

That is a very common feature of Brazilian Portuguese pronunciation.

In many Brazilian accents, an unstressed final o is pronounced like u.

So:

• ovo is often pronounced roughly ôvu
• livro may sound like livru
• carro may sound like carru

The spelling stays o, but the spoken sound often moves toward u.

It sounds natural.

Hoje eu quero... is a very normal way to say what you feel like doing or eating today.

Examples:

• Hoje eu quero descansar. = Today I want to rest.
• Hoje eu quero pizza. = Today I want pizza.
• Hoje eu quero comer um ovo no café da manhã. = natural and everyday

So this sentence does not sound strange or overly translated.

Yes. The sentence is most naturally understood as Today, I want to eat an egg for breakfast.

Because of Hoje, it refers to today, and because of no café da manhã, it places the action in the breakfast context.

If needed, Portuguese can be more specific:

• Hoje de manhã = this morning
• amanhã no café da manhã = tomorrow at breakfast

But your original sentence is already clear and natural.

You usually put não before the conjugated verb:

Hoje eu não quero comer um ovo no café da manhã.

That means:

Today I don't want to eat an egg for breakfast.

So the pattern is:

eu quero → eu não quero

Very straightforward.

Café da manhã is the standard and most widely understood expression in Brazil.

In some regions or informal contexts, you may also hear:

• café used by itself, depending on context
• regional expressions like desjejum, though that sounds much less common in everyday Brazilian speech

For a learner, café da manhã is the best and safest choice.