Baked Onion Dip is hot, cheesy, and full of sweet onion flavor. It’s simple to make and always a hit. Serve warm with toasted baguette slices, crisp veggies, or sturdy chips.
Easy Onion and Cheese Dip
I like this dip because it feels classic and cozy without being complicated. It’s the kind of appetizer that disappears fast at parties or family get-togethers, and it reheats beautifully if you happen to have any left over.
Ingredients for Baked Onion Dip
Here’s what you’ll need. Exact amounts are listed in the printable recipe card at the bottom of the post.
- Cream Cheese – Softened so it blends smoothly with the other ingredients.
- Mayonnaise – Adds creaminess and helps the dip stay rich and smooth as it bakes.
- Sweet Onion – Finely diced for gentle sweetness and flavor in every bite. I used a large Vidalia onion, but any sweet onion will work for this recipe.
- Parmesan Cheese – Adds saltiness and a little sharpness that balances the richness.
- Swiss Cheese – Melts beautifully and adds a mild, nutty flavor. Gruyère cheese is a good substitute, if needed.
- Worcestershire Sauce – I use a vegan Worcestershire sauce to add depth and a little tang that ties everything together.
- Cayenne Pepper – Just a little to add warmth, not heat.
- Black Pepper – Freshly ground for the best flavor.
How to Make Baked Onion Dip
STEP ONE: Preheat Oven. Set oven to 350°F and lightly grease a 4-cup baking dish.
STEP TWO: Mix Ingredients. In a medium bowl, stir together cream cheese, mayonnaise, onion, Parmesan, Swiss cheese, Worcestershire sauce, cayenne, and black pepper until evenly combined.
STEP THREE: Bake. Transfer the mixture to the prepared dish and smooth the top. Bake for 30 minutes, until bubbly and golden brown around the edges.
STEP FOUR: Rest and Serve. Let the dip rest for 15 minutes to set, then serve hot.
Can I Make This Ahead?
- Yes, this cheesy onion dip can be assembled up to a day or two in advance. Cover and refrigerate until ready to bake, then bring to room temperature and bake as directed.
Can I Make This Dip in a Slow Cooker?
- Yes. Mix everything together and cook on low for 2–3 hours, stirring occasionally, until hot and melted.
Make It Vegan 🌱
For a plant-based dip, use vegan cream cheese, mayonnaise, Parmesan, and Swiss-style shreds.
Storage and Reheating
- Store leftovers in an airtight container in the refrigerator. Reheat in the microwave or oven at 350°F until hot.
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Baked Onion Dip Recipe
Ingredients
- 8 ounces cream cheese softened
- 1 cup mayonnaise
- 1 cup sweet onion fienly diced
- 1 cup Parmesan cheese grated
- 3/4 cup Swiss cheese grated
- 1/2 teaspoon vegan Worcestershire sauce
- 1/4 teaspoon cayenne pepper
- 1 teaspoon ground black pepper
Instructions
- Set oven to 350°F and lightly grease a 4-cup baking dish.
- In a medium bowl, stir together cream cheese, mayonnaise, onion, Parmesan, Swiss cheese, Worcestershire sauce, cayenne, and black pepper until evenly combined.
- Transfer the mixture to the prepared dish and smooth the top. Bake for 30 minutes, until bubbly and golden brown around the edges.
- Let the dip rest for 15 minutes to set, then serve hot.
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