of which we can have one for lunch and one in the afternoon (or one for breakfast and one for lunch or two per meal) or that we can use as a crafty meal to compensate if we have overdone it. lunch or dinner.

PROTEIN SUBSTITUTE MEALS
1) The light chocolate smoothie (max two per day instead of a meal or one as a compensation meal)

170 gr of Greek yogurt 0% fat
120 ml light rice milk or light coconut or almond milk light type Alpro or skimmed milk
10 grams of stevia cocoa powder
or other sweetener to taste
3-4 ice cubes
Blend everything and drink immediately. 
Calories: 130, about 15 grams of protein.

Another is a real meal replacement , just like the protein replacement meals you can buy in specialty stores or order online: it has less than 350 calories (it has 323) and a perfect replacement for lunch or dinner.
You can do it with protein powder or egg white (I tell you how).

2) The protein smoothie with chocolate and banana (instead of a meal such as lunch or dinner)
120 gr of ripe banana
150 gr of low-fat flaked cheese like vitasnella or a jar of Fitline exquisa
15 gr of low-fat cocoa with
vanilla flavor
1/2 scoop of chocolate proteins + 150 ml of water
(alternatively 150 gr of egg white cooked in 150 ml of water in a saucepan)
sweetener (if needed, do the taste test in the case of proteins: it could only be used in the option with egg whites)

Blend all the ingredients with 3 ice cubes. If you use egg white, first let the mixture cool before adding it: the egg white will thicken the smoothie making it creamier.
Calories: 323, proteins about 33 grams.