Preheat oven to 425 degrees. Plug the Dash Mini Waffle Maker in the wall and grease lightly once it is hot.
Combine all of the ingredients in a bowl and stir to combine.
Spoon out 1/2 of the batter on the waffle maker and close lid. Set a timer for 4 minutes and do not lift the lid until the cooking time is complete. Lifting beforehand can cause the Chaffle keto sandwich recipe to separate and stick to the waffle iron. You have to let it cook the entire 4 minutes before lifting the lid.
Remove the chaffle from the waffle iron and set aside. Repeat the same steps above with the rest of the chaffle batter.
Cover a cookie sheet with parchment paper and place chaffles a few inches apart.
Add 1/4 to 1/3 cup of the slow cooker keto roast beef from the following recipe. Make sure to drain the excess broth/gravy before adding to the top of the chaffle. (slow cooker Keto Pot Roast recipe here or Instant Pot Keto Pot Roast recipe here)
Add a slice of deli cheese or shredded cheese on top. Swiss and provolone are both great options.
Place on the top rack of the oven for 5 minutes so that the cheese can melt. If you'd like the cheese to bubble and begin to brown, turn oven to broil for 1 min. (The swiss cheese may not brown)
Enjoy open-faced with a small bowl of beef broth for dipping.
The nutritional information provided is only for the chaffles sandwich keto recipe. It does not include the beef or added cheese on top of the sandwich. That info will vary depending on the cut of beef you use and type of cheese.