たまご
egg
tamago
JMdict 1549140
あさごはん朝ご飯for breakfastにたまご卵eggをやいた焼いたfriedよ
Here に (for) marks 朝ご飯あさごはん (breakfast) as the occasion the cooking is for, and を (object) marks 卵たまご (egg) as what was cooked. The verb 焼くやく (fry, grill) shifts to casual past 焼いたやいた (fried), and the final よ (emphasis) shares the news.