Á morgnana borða ég oft hafragraut með mjólk og bláberjum.

Á morgnana means in the mornings or in the morning(s) as a regular habit. It is plural because Icelandic often uses a plural time expression for repeated actions: á morgnana, á kvöldin, á næturnar, and so on.

So this phrase suggests something habitual, not just one single morning.

They are quite different:

• á morgun = tomorrow
• á morgnana = in the mornings

This is a very important distinction for learners, because they look similar but do not mean the same thing.

This is because Icelandic usually follows a verb-second pattern in main clauses.

When the sentence starts with Á morgnana, that time phrase takes the first position. The finite verb then comes second:

• Á morgnana borða ég oft hafragraut...

If you start with the subject instead, then you get:

• Ég borða oft hafragraut á morgnana.

Both are correct. The original sentence simply puts more focus on in the mornings.

In a sentence like this, oft usually comes after the subject and before the main object.

So after the fronted time phrase, the order is:

• Á morgnana = first element
• borða = verb
• ég = subject
• oft = adverb
• hafragraut = object

This is a very normal Icelandic word order.

The dictionary form is hafragrautur. But here it is the direct object of borða, so it appears in the accusative case:

• nominative: hafragrautur
• accusative: hafragraut

So borða hafragraut means eat porridge/oatmeal.

In Icelandic, food items are often used without the definite article when speaking generally.

So:

• borða hafragraut = eat oatmeal / porridge
• not necessarily eat the oatmeal

Also, Icelandic usually puts the at the end of the noun as a suffix rather than as a separate word. But here there is no definite article at all, because the sentence is talking about the food in a general sense.

Here með means with, and in this use it takes the dative case.

That is why the nouns after it must be in the dative:

• með mjólk
• með bláberjum

This is something worth memorizing: prepositions in Icelandic often control the case of the following noun.

Because different nouns change in different ways.

• mjólk has the same form in several cases, including the dative singular, so it stays mjólk
• bláber changes in the dative plural to bláberjum

So even though both nouns are after með, only one of them visibly changes.

Yes, bláberjum is plural. The basic noun is bláber, and it is very commonly used in the plural when talking about blueberries as food.

In this sentence:

• base form: bláber
• dative plural after með: bláberjum

So með mjólk og bláberjum means with milk and blueberries.

Yes. Icelandic often adds the definite article to the end of the noun instead of using a separate word.

So morgnana contains the definite ending and literally corresponds roughly to the mornings. In the full expression á morgnana, the meaning is idiomatic: in the mornings.

Yes, absolutely. That is also correct and natural.

The difference is mainly one of emphasis:

• Á morgnana borða ég oft... = emphasizes in the mornings
• Ég borða oft... á morgnana = a bit more neutral, starting with I

Both are good Icelandic.