In a bowl, mix the flour, oil, water and sugar. Stir until it becomes a homogeneous mass. Add the chemical yeast and mix slowly.
Heat a small frying pan and add a “drizzle” of sunflower oil. Add part of the dough (do not overdo it, as it may be raw inside), add the chocolate pieces and cover. When golden, flip the pancake and repeat the process with the other side.