Preheat oven to 350ºF (180ºC). Line cookie sheet with baking paper.
Sift flour and sugar into large mixing bowl. Add oil, eggs, milk, and vanilla. Beat until smooth.
Spoon mixture onto baking paper to make patty cakes 2" in diameter. Bake in hot oven for 15 minutes until tops of patty cakes are golden.
Remove from oven and cool on a wire rack. While cookies are cooling, melt chocolate in microwave or stir over low heat in a saucepan. Spread melted chocolate over top of cooled patty cake cookies. Sprinkle with finely chopped nuts if you want.