Grind instant oat flakes in a coffee grinder. In a deep bowl, combine soft butter and sugar. Mix well.
Add oatmeal to the oil and mix again.
Beat the egg and mix again.
Pour the flour and knead the dough, it should turn out homogeneous and soft.
Divide the dough into 8 parts, form balls, transfer to a baking sheet covered with parchment and flatten a little on top. Bake at 180 degrees for 20 minutes.
Cool and serve cookies.
Classic oatmeal cookies according to this recipe are very tasty, delicate and aromatic. Cooking is very simple and quite fast, to my taste I would add a little more sugar to accurately determine the amount of sugar, just at the end try the dough to your taste. Most importantly, do not dry the cookie so that it does not become hard. Very tasty with warm milk or hot chocolate.