This southern 3-ingredient sweet onion dip is one of those simple, dependable recipes that feels right at home at potlucks, Sunday suppers, game nights, and holiday snack tables. Sweet onions mellow and turn rich in the oven, and when they bake together with creamy mayonnaise and plenty of shredded Swiss cheese, the whole dish comes out hot, bubbly, and golden with that irresistible scoopable texture folks keep coming back for.
Serve this dip warm with sturdy crackers, toasted baguette slices, pretzel crisps, celery sticks, or bell pepper strips. If you are setting out a full spread, it pairs especially well with little sandwiches, deviled eggs, fruit trays, and a big pitcher of sweet tea, making it easy to turn a humble pan of dip into a crowd-pleasing centerpiece.
Southern 3-Ingredient Sweet Onion Dip
Servings: 8
Ingredients
2 large sweet onions, finely chopped
2 cups shredded Swiss cheese
1 cup mayonnaise
Directions
1. Preheat your oven to 350°F and lightly grease a medium baking dish or 10-inch cast iron skillet.
2. In a large bowl, stir together the chopped sweet onions, shredded Swiss cheese, and mayonnaise until everything is evenly combined.
3. Spread the mixture evenly into the prepared baking dish or skillet.
4. Bake for 35 to 40 minutes, until the top is deeply golden, the edges are bubbling, and the onions are tender.
5. Let the dip rest for 5 minutes before serving so it thickens slightly and stays hot and creamy when scooped.
Variations & Tips
Make-Ahead Tip: You can mix the onions, Swiss cheese, and mayonnaise a day ahead and keep it covered in the refrigerator. When you are ready to serve, just spread it into the skillet and bake, adding a few extra minutes if it is going into the oven cold.
For Picky Eaters: Chop the onions very finely so they soften more as they bake and blend smoothly into the creamy cheese. This helps little ones and onion skeptics enjoy the flavor without noticing big pieces.
Cracker Choice: Because this dip is rich and creamy, serve it with sturdy dippers that will not break easily. Butter crackers, bagel chips, toasted bread rounds, and pretzel crisps all hold up nicely.
Extra Golden Top: If you want a deeper browned finish, place the skillet under the broiler for 1 to 2 minutes at the very end. Watch it closely so the top turns golden and bubbly without burning.
Small-Batch Party Trick: For a snack spread, divide the mixture between small ramekins so guests can enjoy individual portions. They bake a little faster and look extra special on an appetizer table.