6. Preheat and Layer
Preheat your oven to 300 degrees f. Spray the bottom of a three-quart baking pan or casserole dish with non-stick cooking spray, then add one-quarter of your sliced potatoes in an even layer. Spoon one-third of your caramelized onion evenly over your first potato layer. Add one more quarter-layer of potatoes and another third of your onion. Then, evenly add the remaining potatoes and top with the remaining onion to make the final layer.
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