It’s best to reheat the chicken burger patties in the oven or toaster oven. Place a wire rack over a baking sheet and cook for about 3 minutes at 400°F. Alternatively, place the buffalo chicken burgers in a skillet on the stove with a splash of water. Cover with a lid and cook over low heat until warmed through. Or, warm them in the microwave, but do so in bursts on lower power so they don't dry out.