I'm not sure whether to call this a Chayote Squash Gratin or Scalloped Chayote or Cheesy Low Carb Gratin. However, here's what I can tell you. This is perfect low carb gratin to satisfy your rich potato side dish cravings and also when you don't want to eat anymore riced cauliflower as a side dish — though I do love cauliflower rice. Best of all: it's just 5 net carbs per serving.