In a large bowl mash together the margarine and sugar. Add the egg and beat until everything is creamy. Add the baking powder, salt and flour. Stir it up until you have a nice thick dough. In a cereal bowl, combine the cinnamon and the 2 tablespoons sugar.
Shape the dough into balls the size of walnuts or egg yolks. Roll them in the cinnamon-sugar mixture. Place the coated balls on an oiled cookie sheet. Using the bottom of a glass, press the dough down to flatten the cookies slightly. Bake them at 400F for 10 minutes. If your oven runs hot, turn it down to 375°F.