Katherine’s Fabulous, Ridiculously Easy Hot Onion Dip

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This Ridiculously Easy Hot Onion Dip is the one you want to make when you have minimal time but you want fabulously delicious results that will bring rave reviews!

This recipe is one of those little gems you’ll find yourself making again and again. It’s not only ridiculously easy to throw together, but it’s also one of the most ridiculously delicious appetizers that you’ll ever have the pleasure of meeting… or eating… or sharing with others. A pan of this Hot Onion Dip, emerging from the oven, all golden and bubbly, with its heavenly aroma is a party waiting to happen!

Overhead horizontal photo of a cast iron skillet of Ridiculously Easy Hot Onion Dip surrounded by sliced apples and crostini.

Did you ever taste something so delicious that you couldn’t forget it? That’s the story, in a nutshell, of how this Ridiculously Easy Hot Onion Dip recipe ended up in my collection.

Vertical overhead photo of a cast iron pan of Ridiculously Easy Hot Onion Dip surrounded by apple slices and crostini.

I generally like to go light on appetizers. Especially when I know there’s going to be a really good dinner coming up as I hate to spoil my appetite before the meal even starts. But last Christmas we were invited to a lovely dinner party and things ended up a little different. Amid pre-dinner conversation, I noticed everyone enjoying a warm appetizer dip. Thinking I’d have just a nibble, (the party hostess, Katherine, is a graduate of the CIA so I knew the dinner would be fabulous!), I took a chip and scooped up a bit of the golden, cheesy dip.

Horizontal extreme closeup overhead photo of a pan of Ridiculously Easy Hot Onion Dip.

I popped the dip/chip in my mouth and was amazed at the delicious flavor. Hmm… let’s just say I ended up having WAY more than “a nibble” of the appetizer. The dinner was also delicious but I knew I had to have the recipe for the fabulous dip. When I asked Katherine about it, she said, “Oh, it’s just the hot onion dip that’s been around forever.”

An old new recipe!

Sometimes I feel like I’ve been living under a rock. How could I have not known about “the hot onion dip that’s been around forever”? I texted Katherine the next morning for the recipe. When she replied I was shocked… such a short, simple 3-ingredient, 2-step recipe. This is one of those situations that exemplifies the old saying; “the whole is more than the sum of its parts”. Here’s Katherine’s recipe:

1 cup of chopped sweet onion
1 cup of mayo (I use Hellman’s because it won’t separate)
1 cup shredded cheese (I used bagged cheddar but have done all kinds of other cheeses)

Bake @ 350/375 in a greased pan until golden and bubbly. About 40 min @ 350.

I’ve been making this hot onion dip ever since and everyone who tries it stops in their tracks with the first bite. Then I hear comments like, “Oh my goodness, what is that?” or “Wow, so good!” or “That dip is amazing!”. And for the next gathering, “Could you make that dip again?”. Thanks, Katherine, you’ve made me an appetizer celebrity!!

Vertical overhead closeup photo of a cast iron pan of Ridiculously Easy Hot Onion Dip surrounded by sliced apples and crostini.

Ridiculously Easy

If you’ve been following The Café for any amount of time you probably are aware that Ridiculously Easy is one of our trademarks. We have an entire collection of recipes with this descriptive moniker and these easy recipes are, by far, the most popular recipes on the site. We’ve got cakes, cookies, snacks, salad dressings, scones, biscuits, jams, jellies… and so much more!

You can read more about these RE recipes in this post and see the whole collection here, but my streamlined definition is, “These are the recipes that make you look like a kitchen rock star with just a teeny bit of effort on your part”. This hot onion dip is all that!

Vertical overhead photo of a black cast iron pan of Ridiculously Easy Hot Onion Dip on a wood appetizer tray surrounded by slices of apples and crostini.

Okay, there’s not much more to say except, “Make this hot onion dip ASAP”! And when someone says, “Wow! What is this?”, you can be as smart and charming as my friend, Katherine and say, “It’s just the hot onion dip that’s been around forever.”

Horizontal overhead photo of Ridiculously Easy Hot Onion Dip in a cast iron pan and on crostini.

Cafe Tips for Making this Ridiculously Easy Hot Onion Dip

  • For effortless entertaining, this dip can be thrown together in advance and refrigerated until an hour before your guests arrive. Allow it to sit out for 20 minutes while the oven preheats. Then let the oven do the magic and send amazing aromas through the house.
  • The original recipe for this hot onion dip calls for 1 large sweet onion. Sweet onions include Vidalia, Walla Walla, Texas Sweets, Maui and Carzalia. As the name suggests, sweet onions have a sweet flavor due to a high natural sugar content and are perfect for this recipe.
  • Sometimes I use half of a sweet onion and half of a red onion for a fun color and flavor contrast.
  • Leftover hot onion dip (although you usually won’t have any leftovers) can be re-warmed in the microwave. You can also make an amazing grilled cheese with it!
  • You can make this hot onion dip in any oven-safe pan but I love to use a small cast iron pan for a pretty presentation.
  • Feel free to change up or use a blend of different cheeses for this recipe. Cheddar is great as is Gouda, Havarti, Provolone, Gruyere and Swiss. A portion of Parmesan is also delish!
  • For a little gourmet touch, I like to add some chopped fresh herbs both in the dip and as a pretty garnish. Rosemary, thyme, basil and oregano (or a combination) are all wonderful!
  • I like to serve this hot onion dip with crostini. You can also serve it with crackers, pita chips, tortilla chips or slices of fresh baguette – all of these options are delicious!

Thought for the day:

 But when the fullness of time had come,
God sent forth His Son,
born of woman, born under the law,

 to redeem those who were under the law,
so that we might receive adoption as sons.
Galatians 4:4-5

What we’re listening to for inspiration:

In the Fullness of Time

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If you enjoy this recipe, please come back and leave a star rating and review! It’s so helpful to other readers to hear your results, adaptations and ideas for variations.

Katherine’s Ridiculously Easy Hot Onion Dip

This Ridiculously Easy Hot Onion Dip is the one you want to make when you have minimal time but you want fabulously delicious results that will bring rave reviews!

Author: Chris Scheuer

Prep Time:
5 mins

Cook Time:
40 mins

Total Time:
45 mins

Servings: 12 people

Calories: 170 kcal


  • 1
    chopped sweet onion
    1 medium onion
  • 1
    I use Hellman’s
  • 1
    shredded Cheddar cheese
    Other cheese varieties are also delicious, see the Café Tips for other options.
  • 1
    finely chopped fresh herbs


  1. Preheat the oven to 350˚F. Spray a small baking dish or 6-inch cast iron pan with non-stick cooking spray. Line a sheet pan with foil for easy cleanup. Set aside.

  2. Combine the onion, mayonnaise, cheese and 2 teaspoons of the fresh herbs (if using) in a medium size bowl. Stir well to combine.

  3. Transfer the onion mixture to the prepared pan and set the pan on the foil-lined sheet pan.

  4. Bake for 35-45 minutes until golden and bubbly.

  5. Garnish with the remaining teaspoon of fresh herbs (if using). Serve hot and enjoy!

Recipe Notes

See Café Tips above in the post for more detailed instructions and tips to ensure success.
If you prefer to use Metric measurements there is a button in each of our recipes, right above the word “Instructions”. Just click that button to toggle to grams, milliliters, etc. If you ever come across one of our recipes that doesn’t have the Metric conversion (some of the older recipes may not), feel free to leave a comment and I will add it.

Calories 170kcal

Fat 17g

Saturated fat 4g

Trans fat 0.03g

Polyunsaturated fat 8g

Monounsaturated fat 4g

Cholesterol 17mg

Sodium 181mg

Potassium 27mg

Carbohydrates 1g

Fiber 0.1g

Sugar 1g

Protein 2g

Vitamin A 107%

Vitamin C 1%

Calcium 71%

Iron 0.1%

Katherine\'s Fabulous, Ridiculously Easy Hot Onion Dip

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