맛있게 is an adverbial form of an adjective 맛있다. 오늘 친구랑 식사했어. 오늘 친구랑 '맛있게' 식사했어. 오늘 친구랑 맛있게 '저녁 식사를 했어'. 오늘 친구랑 '저녁 식사(를') '맛있게' 했어. In this sentence, '맛있게 하다' is different than the pattern of 'you make me happy.' c.f. '오늘 친구랑 저녁 반찬을 맛있게 했어.' What does this sentence mean?

In this case, "to make sth" is not used. 맛있게+하다 is made up of adverb(good) + 하다(do). So literally 오늘 친구랑 저녁식사 맛있게 했어 is "I did a dinner well with my friends," and the liberal translation would be "I made a good dinner of it with my friends." It would be kind of confusing :).. Sorry for my English and hope you'll understand better

This expression doesn't translate perfectly into English. "오늘 친구랑 저녁 식사 맛있게 했어" translates into "I ate dinner deliciously with my friends today." Obviously, we don't talk like that in English, but the meaning is the same as, "We had a good dinner," or "I had a delicious dinner." In English we say, "Have a good dinner," but in Korean it's, "저녁 식사 맛있게 받으세요."