Eating homemade food as soon as it's made is enjoyable.
手作り hand made/home made
料理 food/dishes/cooking
出来立て as soon as it's made/freshly made
食べられること eating
幸せなこと enjoyable
「一人暮らしなので、食堂でおばちゃんが作った定食が美味しかったとき幸せだ」というのは I live alone so eating set meals from the dining hall made by ladies tastes great and is enjoyable と表現できます。
参考になれば幸いです。