Mix together the egg, nutella and flour until well combined.
Preheat oven to 350 degrees F. Line 2 cookie sheets with parchment paper. Using a teaspoon, drop small dollops of batter onto prepared cookie sheets; leaving about 3 inches space between them (the cookies will spread a lot and be very thin).
Place on the middle rack of the oven and bake for 8-10 minutes. Remove from the oven and let cool on baking sheet for 1-2 minutes. Then carefully transfer cookies to a baking rack and let cool completely.
Serve with a cup of tea and enjoy.