食べる

How it works

を (object) marks 朝ごはんあさごはん (breakfast) as the thing being eaten, and it sits before the verb 食べるたべる (eat) — Japanese puts the verb last. The verb stays in its plain dictionary form, so this sounds casual. The final よ (you know) adds a light push, like telling someone “I'm going to eat breakfast, just so you know.”