This is almost the next-best thing to cooking your main and side on a sheet pan. To be clear, though, this is not a one-pan experience. By giving the chicken a simultaneous turn in a separate skillet ...

1/4 cup ( 1/2 stick) salted butter Melt the butter in a 10-inch cast-iron skillet over medium heat. Add the onions and cook, stirring occasionally, for 5 minutes. Add the potatoes. Stir and continue ...