Hot Baked Onion Dip is an incredibly simple, crowd-pleasing appetizer made with just three main ingredients: chopped sweet onion, real mayonnaise, and shredded Swiss cheese. It’s perfect for holidays, game day, potlucks, or any time you want a warm, cheesy dip that’s effortless to prepare.
This baked onion dip is one of those recipes that becomes an instant favorite. Even people who say they don’t like onions tend to come back for seconds because the onions mellow while baking and blend beautifully with the creaminess of the mayonnaise and the nutty flavor of Swiss cheese. The recipe is often called the “2+2+2 Dip” because it uses two cups of each ingredient—an easy way to remember the proportions.
The method is straightforward: mix the ingredients, transfer to a baking dish, and bake until the top is golden and bubbly. It takes very little hands-on time, which makes it ideal when you’re prepping several dishes for a gathering. Below you’ll find the ingredient list, step-by-step instructions, helpful tips for making it ahead, and a few serving ideas.
How to make Hot Baked Onion Dip:
- Preheat the oven to 400°F (200°C) and lightly grease an 8″ x 8″ baking dish.
- In a medium mixing bowl, combine 2 cups chopped sweet onion, 2 cups real mayonnaise, and 2 cups shredded Swiss cheese. Stir until the ingredients are evenly blended.
- Spread the mixture into the prepared baking dish in an even layer.
- Bake for about 25–30 minutes, or until the cheese is bubbly and the top is lightly browned. If the top browns too quickly, cover loosely with foil and continue baking until heated through.
- Remove from the oven and gently blot the surface with a paper towel to absorb any excess oil. Let the dip rest for a few minutes, then serve warm.
Serve with sturdy crackers, toasted French bread slices, pita chips, or vegetable sticks. This dip pairs well with crisp apples or pears for a contrasting sweet bite.
Ingredients
- 2 cups real mayonnaise
- 2 cups sweet onion, chopped
- 2 cups Swiss cheese, shredded
Instructions
- Preheat oven to 400°F and grease an 8″ x 8″ baking dish.
- Mix the mayonnaise, chopped onion, and shredded Swiss cheese in a bowl until well combined.
- Transfer the mixture to the baking dish and smooth the top.
- Bake 25–30 minutes, until bubbly and lightly golden on top.
- Let the dip sit a few minutes, blot any excess oil, and serve warm.
Make-ahead and storage
You can prepare the dip up to two days in advance. Combine the ingredients, cover tightly, and refrigerate. When ready to serve, transfer to the baking dish and bake as directed. Leftovers keep in an airtight container in the refrigerator for 3–4 days and can be reheated in a 350°F oven until warmed through.
Tips and variations
- Use sweet or mild onions to keep the flavor balanced; sautéing the onions briefly before mixing will mellow them further but is optional.
- Swap part of the mayonnaise for sour cream or Greek yogurt if you prefer a tangier dip—start with substituting 1 cup and adjust to taste.
- For a sharper flavor, substitute part of the Swiss cheese with Gruyère or mild cheddar, or add a pinch of smoked paprika for warmth.
- If you want a crispier top, broil for 1–2 minutes at the end of baking, watching carefully to avoid burning.
Serving suggestions
This hot onion dip is an excellent centerpiece for a snack table. Serve it alongside an assortment of crackers, crostini, toasted baguette slices, or a vegetable platter with carrots, celery, and bell pepper strips. It’s also delicious spooned over baked potatoes or used as a rich topping for grilled meats.
6 appetizers to consider for game day
- Crab Meat au Gratin
- Garlic Tuscan Shrimp Dip
- Buffalo Chicken Pinwheels
- Pink Shrimp Dip
- New Orleans BBQ Shrimp
- Classic Deviled Eggs
Notes
- This dip keeps well when made ahead and refrigerated for up to two days before baking.
- Adjust seasonings and cheese choices to suit your guests’ preferences—this recipe is a versatile base that welcomes small tweaks.