Mix together the 1/3 cup sugar and 2 tsp cinnamon; set aside.
Spray 18 muffin cups with non stick spray. Preheat oven to 350 degrees.
Combine flour, baking powder, soda, and salt in a small bowl; set aside.
Beat together sugar, sour cream, butter, and oil in a large mixing bowl. Add eggs and vanilla and beat well. Stir in dry ingredients till just combined. Don't over mix, it's ok if there are a few lumps.
In prepared muffin cups, divide half of the batter between 18 muffin cups.
Sprinkle with half of the cinnamon sugar mixture. Top with remaining batter, then sprinkle the rest of the cinnamon sugar on top.
Bake at 350° for 15-18 minutes. Let cool for about 5 minutes, then remove to wire racks to cool.