Step 1

Preheat oven to 175ºC (350°F) and fold a 20 cm (7.8 inches) cake mold with parchment paper

Step 2

In a large mixing bowl, beat the egg together with the Greek yogurt until smooth.

Step 3

Add oat flour, protein powder, cocoa powder and baking powder.

Step 4

Start mixing, gradually adding the milk until you get a smooth cake batter - the amount of milk depends on the protein powder used (see notes*).

Step 5

Transfer the protein batter to the prepared mold and bake in hot oven for 20 to 25 minutes. Let cool before serving.