你可以用 "I'll make the side dishes" 来表示 "别人做饭我做菜"。

"Side dishes" 在这里指的是主菜的配菜,如蔬菜、沙拉、面包、饮料等。

例句:

"Would you pke to cook the main dish while I make the side dishes?" (你想做主菜,我做配菜好吗?)
"I'll bring over a salad and some bread as side dishes for the barbecue." (我会带沙拉和一些面包作为烧烤的配菜。)
"We have enough food for everyone if we each bring a side dish to the potluck." (如果我们每人带一道配菜来参加这个聚餐,就有足够的食物了。)