In a large mixing bowl whisk together the oil, eggs, sugar, vanilla and sour cream. Add flour, baking powder, salt, and soda and mix well with a large spoon. Fold in pecans. In a smaller bowl mix the sugar and cinnamon for the topping. Batter will look like cake batter.
Drop by tablespoon full onto a very lightly sprayed cookie sheet. Sprinkle a pinch of the sugar and cinnamon topping on each cookie. Bake in a preheated 350 degree oven 15 to 20 minutes. Makes about 2 1/2 dozen depending on the size you make the cookies.
Notes
These cookies make about 2.5 dozen, so I set the servings at 8 since most people have about 4 cookies.