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Beef and Cheddar Chaffle Sandwich

Beef and Cheddar Chaffle Sandwich – a twist on a classic sandwich that’s an easy fix for lunch or dinner. And, it’s loaded with flavor and not many carbs! Hungry? Read on and I, Chef Jenn, will show you all my tips and tricks to make this hearty meal in no time!

keto beef and cheddar chaffle sandwich
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Made with simple ingredients but loads of flavor, you can enjoy this amazing Beef and Cheddar Chaffle sandwich (chaffwich) open-faced or as a hearty two-handed sandwich.

Grab your chaffle maker and let’s get cooking!

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Ingredients to Make Beef and Cheddar Chaffle Sandwiches

  • 2 of your favorite chaffles (or 1 if you’re going open-faced)
  • Sliced beef
  • Sliced or shredded cheddar – go for sharp cheddar for maximum flavor
  • Onions
  • Mayonnaise – optional

How To Make Beef and Cheddar Sandwich

I like to call chaffle sandwiches chaffwiches. It might never take off, but it’s a fun way to get the point across!

Making this keto roast beef sandwich is as simple as 1, 2, 3.

  1. Make your chaffles.
  2. Sautee the onions.
  3. Assemble it and put it under the broiler for a few minutes to melt the cheese.

Variations on the Beef and Cheddar Sandwich

Swap out the mayonnaise for this sharp and tangy Horsey Sauce to make it more like Arby’s roast beef sandwich with horseradish sauce, or smother on some grainy mustard.

Top it with a mixture of sauteed mushrooms and peppers to make it more Philly-style.

Chef Jenn’s Tips to Make This Beef and Cheddar Chaffle Sandwich

  • Make the chaffles ahead of time to save time! They freeze great and can be heated up in the toaster or back in the Dash chaffle maker.
  • I use leftover roast beef that I’ve sliced very thin. See how to make perfect roast beef for sandwiches right here. Alternatively, sliced beef it can be purchased at many deli counters.
  • Sharp cheddar cheese is going to really enhance the flavors of this sandwich.
  • Skip the onions if you’re doing strict keto.

What To Serve With This Beefy Sandwich

I’m a big fan of soups and sandwiches, so when I make this keto pork recipe I love pairing it with a hearty soup. This keto beef sandwich pairs really nicely with Cream of Mushroom Soup, or you can go with something a bit heartier like this delish Minestrone.

Salads are another tasty pick with keto lunch recipes, and they don’t have to be fancy or involved like this Cobb Salad. Just a handful of greens and a delish Ranch Dressing will have you all set and ready to go!

How to reheat roast beef?

Topping this sandwich with onions and then melting the cheddar under the broiler should warm up your roast beef enough. Or, you can wrap it tightly in foil and heat it in a low oven (about 325-F) for about 10 minutes, switching the slices around about halfway through. Heating it in the microwave is likely to overcook it, so if you do use the microwave, just do it in 20 second intervals.

Is roast beef keto?

Heck yes. A great source of protein, roast beef is on the leaner side so you may need to add more fats. But yes, it’s a great pick on a keto diet.

Can I freeze this roast beef and cheese sandwich?

I wouldn’t freeze the whole thing together, but rather freeze the individual components. Making chaffles ahead of time is a great time-saver. Freeze them tightly wrap then just thaw and reheat what you need. The beef will also freeze, if you wrap it tightly.

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keto beef and cheddar chaffle sandwich
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5 from 4 votes

Beef and Cheddar Chaffwich

Loaded with flavor, this Beef and Cheddar Chaffwich is an easy fix for a hearty meal!
Course Keto Lunches
Cuisine American
Keyword beef, chaffle, chaffle recipe, roast beef
Prep Time 10 minutes
Cook Time 10 minutes
Total Time 20 minutes
Servings 1 serving
Calories 423kcal
Author Chef Jenn


  • 2 chaffles or 1 if you're going open-faced
  • 1/2 tbsp avocado oil
  • 1/4 cup sliced onion
  • 1 tbsp mayonnaise
  • 4 ounces roast beef cooked
  • 1/4 cup cheddar cheese shredded


  • In a small skillet over medium heat, heat the oil and add the onions. Sautee the onions until they're translucent. About 4-5 minutes.
  • Lay one chaffle on a flat surface and spread on the mayonnaise. Then, top it with the roast beef, shredded cheese, and onions.
  • Pop it under the broiler for 2-3 minutes or until the cheese is melted. Enjoy!


The nutritional values for the chaffles are not included in this recipe. Please add the values of whatever chaffle you choose to use.


Serving: 1sandwich | Calories: 423kcal | Carbohydrates: 5g | Protein: 32g | Fat: 31g | Saturated Fat: 10g | Polyunsaturated Fat: 8g | Monounsaturated Fat: 12g | Trans Fat: 1g | Cholesterol: 100mg | Sodium: 1973mg | Potassium: 406mg | Fiber: 1g | Sugar: 2g | Vitamin A: 293IU | Vitamin C: 54mg | Calcium: 532mg | Iron: 3mg | Net Carbohydrates: 4g

A Note on Nutritional Information

Nutritional information for this recipe is provided as a courtesy and is calculated based on available online ingredient information. It is only an approximate value. The accuracy of the nutritional information for any recipe on this site cannot be guaranteed. Erythritol carbs (sugar substitutes) are not included in the carbohydrate counts as they have been shown not to impact blood sugar, and they have zero calories and zero carbs. Net carbs are the total carbs minus fiber.

Need even more keto and low carb recipes? Check out these meaty casseroles, and this family favorite sausage recipe. Breakfast is a cinch on a keto or low carb diet, and this gluten-free corned beef hash is always a tasty dish.

about jenn

Hi, I’m Jenn!

I’m a cookbook author (Keto Soup Cookbook and Keto Diabetic Cookbook and Meal Plan) as well as a retired chef, recipe developer, and writer of this blog (that’s a lot of hats!). I embarked on a journey to create foodie-worthy Keto-friendly meals that any home cook can be proud of! No matter if you’re low-carb, no-carb, dirty, or strict Keto, there are recipes in Keto Cooking Wins for you and your family. Read more...

6 thoughts on “Beef and Cheddar Chaffle Sandwich”

  1. 5 stars
    Wow, this looks amazing!! I am definitely adding this to my weekend meal ideas. Thank you so much for the recipe 🙂

  2. 5 stars
    This was everything a gourmet sandwich should be, and then some! So delicious and hearty; easily, a new favorite way to enjoy roast beef!

  3. 5 stars
    Yummy! I can’t wait to try this! Looks so delicious and very tasty! Excited to share this with my family!

  4. fyi – Keto bread is now available by Orowheat, my main goto for sammiches, sometime I use low-carb tortillas for sammiches & wraps! There are several brands on the store shelves now, but the Mission ones r my fav. I would definitely make this beef & cheddar with one of these keto friendly products!

5 from 4 votes

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