Keto Beef and Cheddar Chaffwich (Copycat Style)

I like to call chaffle sandwiches chaffwiches, it might never take off, but it gets the point across. Keto beef and cheddar chaffwich is loaded with flavor, whether you eat it open-faced or as a hearty two-handed sandwich.

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Making this is as simple as 1, 2, 3, make your chaffles, sautee the onions, then assemble and broil.

I use leftover roast beef, sliced thin, but sliced beef from the deli counter works just as well.

Chef Jenn’s Take on Beef and Cheddar Chaffwich

Make the chaffles ahead of time to save real time, they freeze great and reheat well in the toaster or back in the waffle maker.

Sautee the onions in oil until translucent, about 4 to 5 minutes, and skip them entirely if you are doing strict keto. Lay the chaffle flat, spread on the mayo, then top with the roast beef, cheese, and onions. Broil for 2 to 3 minutes, until the cheese melts. Use my own Keto Roast Beef sliced thin, or sliced deli beef works just as well. Sharp cheddar cheese really enhances the flavor here.

Swap the mayo for Horsey Sauce to make this more like a certain roast beef chain’s sandwich, or use grainy mustard instead. Top it with sauteed mushrooms and peppers for a Philly-style version if you want something different.

For reheating, the broiler warms the beef and melts the cheese at the same time. You can also wrap it in foil and heat it in a 325 degree oven for about 10 minutes, flipping halfway through. The microwave risks overcooking it, so use 20-second intervals if you must. Freeze the components separately rather than the assembled sandwich.

What You’ll Love About Beef and Cheddar Chaffwich

• Ready in about 20 minutes, real lunch or dinner speed.
• Loaded with flavor, works open-faced or as a full two-handed sandwich.
• A great way to use up leftover roast beef.

Ingredients

• 2 of your favorite chaffles – Or 1 if you’re going open-faced.
• Sliced beef – Leftover Keto Roast Beef, sliced thin, or deli-sliced beef.
• Sliced or shredded cheddar – go for sharp cheddar for maximum flavor
• Onions – Sliced. Skip for strict keto.
• Mayonnaise – Optional. Horsey Sauce or grainy mustard work as substitutes.

How to Make Beef and Cheddar Chaffwich

Scroll down for the full recipe card with exact measurements and printable instructions.

Heat the oil in a small skillet over medium heat and add the onions. Sautee until translucent, about 4 to 5 minutes. Lay one chaffle on a flat surface and spread on the mayonnaise. Top with the roast beef, shredded cheese, and onions. Broil for 2 to 3 minutes, or until the cheese is melted.

Make It A Meal

I’m a big fan of soup and sandwich combos, this pairs beautifully with Cream of Mushroom Soup. For a salad, Cobb Salad with Ranch Dressing is another easy, tasty option.

If you love this format, French Dip Chaffwich is another great sandwich to add to your rotation.

Storage

Freeze the components separately rather than the whole assembled sandwich. Chaffles freeze well tightly wrapped, and the beef will also freeze if wrapped tightly. Thaw and reheat what you need.

Frequently Asked Questions