This southern 3-ingredient baked sweet onion dip is the kind of simple, old-fashioned party food that disappears fast at potlucks, church suppers, and family gatherings. Sweet onions mellow and turn tender in the oven, blending into a rich, creamy dip with a beautifully browned top that feels extra special even though it takes almost no effort. It is a wonderful recipe to keep on hand when you need something warm, comforting, and dependable for a crowd.
Serve this dip warm with buttery crackers, toasted baguette slices, corn chips, or sturdy potato chips for scooping. It also goes nicely with fresh celery sticks and bell pepper strips if you want something crisp alongside the richness, and it fits right in on a snack table with little sausages, deviled eggs, and a simple relish tray.
Southern 3-Ingredient Baked Sweet Onion Dip
Servings: 8
Ingredients
2 large sweet onions, finely chopped
1 cup mayonnaise
2 cups shredded Swiss cheese
Directions
1. Preheat the oven to 350°F and lightly grease a small glass or ceramic baking dish.
2. In a medium mixing bowl, stir together the finely chopped sweet onions, mayonnaise, and shredded Swiss cheese until everything is evenly combined.
3. Spread the mixture evenly into the prepared baking dish.
4. Bake for 35 to 40 minutes, until the dip is hot and bubbly and the top is golden brown around the edges.
5. Let the dip rest for 5 to 10 minutes before serving so it thickens slightly and is easier to scoop. Serve warm with crackers, chips, or toasted bread.
Variations & Tips
For a milder flavor: If you are serving little ones or anyone sensitive to onions, chop the onions very fine so they soften more completely as they bake. The flavor turns sweeter and gentler the smaller they are cut.
Make-ahead tip: You can mix the dip a day ahead, cover it, and keep it in the refrigerator until you are ready to bake. Letting it sit out for about 20 minutes before baking helps it cook more evenly.
Cheese swap: Swiss gives this dip its classic flavor, but mozzarella will make it milder and stretchier, while a mix of Swiss and Monterey Jack keeps it creamy with a softer bite for picky eaters.
Doneness tip: Bake until the center is fully hot and the edges are bubbling well. If the top is browning too quickly, loosely tent the dish with foil for the last few minutes.
Serving tip: This dip is best warm, but it stays tasty at room temperature for a while on a snack table. If needed, reheat it briefly in the oven to bring back that creamy texture.