For a richer flavor, try using Gruyere cheese instead of Swiss. To prevent the onions from browning, cook them over medium-low heat and stir frequently. If you don't have half-and-half, you can use a mixture of equal parts milk and heavy cream. This casserole can be assembled ahead of time and refrigerated for up to 24 hours before baking. Add about 15 minutes to the baking time if baking from cold. Consider adding a pinch of nutmeg or white pepper for added depth of flavor.
Norval Skiles
Jun 4, 2025I've made this casserole for several potlucks, and it's always a hit. It's so easy to make and always gets rave reviews.
Norval Skiles
Mar 1, 2025This recipe is a game-changer! My family devoured it. The sweet onions and Swiss cheese are a match made in heaven.
Willis Littel
Sep 23, 2024I added some sautéed mushrooms to the onion mixture, and it was absolutely delicious! Thanks for the great recipe!