>> source: Mama

First, heat up the @butter{200%g} just enough for it to melt. Wait until it cools down before using
In a bowl, mix @flour{220%g}, @oats{150%g}, @brown sugar{220%g}, @baking powder{8%g}, ground @cinnamon{2%tsp}
Mix in the butter. Preheat the oven 
Whisk @egg{2} whites until soft peaks are formed. Add @vanilla essence{1/2%tsp} and mix.
Mix the egg white foam into the bowl with the rest of the ingredients. It should be sticky
Form small spheres of around 15 grams each. Form the quickly, as the dough is sticky, using the palms of the hands. The spheres should have around 4½cm diameter
Bake at 180C for ~{30%min} until slightly browned on top and until a testing stick comes out clear