My proteins of choice are all that is either carb free or very low carb -
Eggs in any form - backed, boiled, scrambled.
Cheese - Cheddar, Gauda, Edam, Emmenthal, Feta
Protein shakes - be careful which one you pick and check the grams per serving carb content
Bacon - love love bacon
Tuna - Any fish as long as it is not crumbed or dipped in anything
Chicken - with skin on. Leftovers can be used cold in a salad
Any beef or pork or lamb meat