Sift together flour, baking powder, cinnamon, and salt.
Combine dry ingredients with egg mixture and stir in vanilla.
Bake for 8-10 minutes on an ungreased baking sheet until lightly browned but still soft.
Notes
I like to slightly underbake my cookies and then let them continue heating on the pan, so I take them out at 8mins and then leave them on the cookie sheet for 2mins before removing them to cool.