I am on a low-carb diet, too, so I only eat the keto-bread that I make in the microwave that is carb-free. I use regular butter because it is so much healthier than margarine, which is known to cause clogged arteries in people. What do you mean by "anchor butter", @janemariesayed ? Is it a special kind of butter, or is that just a brand name ? I use butter, or cheese on my hot vegetables, too; since that is perfectly fine on a low-carb diet. I like avocado, and I have used it mashed on sandwiches along with cream cheese, and I think that it would also work fine on a keto-bread sandwich.