На завтрак я поджарю хлеб в тостере.

For breakfast, I will toast bread in the toaster.

Breakdown of На завтрак я поджарю хлеб в тостере.

• я: I
• в: in
• на: for
• завтрак: the breakfast

Questions & Answers about На завтрак я поджарю хлеб в тостере.

Why is it на завтрак, not something like для завтрака?

На завтрак is the normal idiomatic way to say for breakfast / as breakfast in Russian.

• На завтрак = for breakfast
• similarly:
  • на обед = for lunch
  • на ужин = for dinner

Для завтрака usually means for breakfast in a more literal-purpose sense, but it is much less natural here. In everyday Russian, when talking about what someone eats or makes for a meal, на + meal is the usual pattern.

So:

• На завтрак я поджарю хлеб в тостере. = natural
• Для завтрака я поджарю хлеб... = possible in some contexts, but not the normal everyday phrasing

Why is я included? Could it be omitted?