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11. Remove from the oven and let cool for a few minutes before serving.
Variations & Tips
For a slightly different flavor profile, try using Swiss cheese instead of Gruyère or adding a touch of blue cheese for added depth. You could also incorporate some cooked and crumbled bacon or pancetta for a meaty twist. To make the dish more wholesome, consider adding some cooked spinach or kale to the cheese sauce before baking. Lastly, if you prefer a spicier version, a pinch of red pepper flakes can be added to the caramelized onions.
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