More low-carb breakfasts. 1  Leftovers from last night’s dinner. 2  Coffee with cream. 3  A can of mackerel and boiled eggs.  Avocado, salmon and sour 1  cream. Cheese with butter.  Boiled eggs mashed with butter, chopped chives, salt and 1  pepper. A piece of brie cheese and some ham or salami (or a full breakfast tapas  plate)