Time Saving Tip
If you’re a little short on time, set the potatoes and onions in the dish as directed and cover with plastic wrap. Microwave on full power for about 10 minutes (be careful, it will be hot when removing the plastic wrap). Add the cheese sauce and bake as directed below for about 45-55 minutes. Equally delicious… just a little bit quicker!
Make-Ahead
This dish can be made 24 hours in advance. Ensure the potatoes are completely covered in the sauce as any exposed bits of potatoes will discolor slightly. Cover tightly with plastic wrap and refrigerate.
Remove from the fridge at least 30 minutes before baking. You may need to add 10 minutes to the baking time.
While we most often eat these as a side, I sometimes make Potatoes Au Gratin with ham by including slices or diced leftover ham (from our favorite Crock Pot Ham) before baking.
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