a thick omelette (= a flat, round food made by frying eggs that have been mixed together), with potato and sometimes onion or other vegetables in it

He decided to make her a Spanish omelette for breakfast. 他决定给她做一个西班牙煎蛋饼当早餐。

You could have a slice of Spanish omelette instead of a sandwich. 你可以吃一片西班牙煎蛋饼来代替三明治。