This Southern-style baked onion dip is the kind of old-school party recipe that earns a permanent place in your entertaining rotation because it is simple, rich, and deeply savory with very little effort. Sweet onions soften and mellow as they bake into a creamy base, while the top turns beautifully browned and bubbling, giving you that irresistible contrast between the jammy center and the golden edges that makes everyone hover near the pan.
Serve this dip hot with sturdy potato chips, buttery crackers, toasted baguette slices, or crisp celery sticks for contrast. If you are building out a snack spread, it fits especially well alongside pimento cheese, deviled eggs, pickles, and a tray of fresh vegetables, and it is equally at home next to burgers, pulled pork sandwiches, or a pot of chili on game day.
Southern 4-Ingredient Baked Onion Dip
Servings: 8
Ingredients
2 large sweet onions, finely chopped
1 cup mayonnaise
1 cup shredded Parmesan cheese
1/2 teaspoon black pepper
Directions
1. Preheat the oven to 350°F and lightly grease a small baking dish or 8-inch cast iron skillet.
2. In a medium bowl, combine the finely chopped sweet onions, mayonnaise, shredded Parmesan, and black pepper. Stir until the onions are evenly coated and the mixture looks thick and creamy.
3. Spread the mixture evenly into the prepared baking dish or skillet, smoothing the top so it bakes evenly.
4. Bake for 35 to 40 minutes, until the dip is hot throughout, bubbling around the edges, and deeply golden brown on top.
5. Let the dip rest for 5 to 10 minutes before serving so it sets slightly and scoops more easily. Serve warm.
Variations & Tips
Use Vidalia onions when available: If you can find Vidalia or another sweet onion, this dip develops the best mellow flavor as it bakes. Standard yellow onions will still work, but the final dip will taste a little sharper.
Chop the onions finely: Small, even pieces soften more thoroughly and blend into the creamy base. Larger chunks can stay too firm, so take an extra minute with your knife for a smoother dip.
Make it ahead: You can mix the dip several hours in advance and refrigerate it covered in the baking dish. When ready to bake, let it sit at room temperature for about 20 minutes, then bake as directed, adding a few extra minutes if needed.
Try a cheesier top: For a slightly more pronounced crust, sprinkle a little extra Parmesan over the top before baking. It helps create a darker, crisper finish that pairs especially well with sturdy chips.
Serve it hot, not scorching: Right out of the oven, the dip will be very loose and extremely hot. A short rest improves both texture and flavor, and it also keeps the creamy top from sliding off the chip on first scoop.