Preheat oven to 350 degrees. Cream together the butter, sugar and brown sugar until light and fluffy. Add in the eggs and vanilla; mix well. Mix the flour, baking soda, salt and pumpkin pie spice; gradually add to butter mixture. Stir in the oats until incorporated.
Drop by tablespoon onto a baking sheet about two inches apart. Bake for 10-12 minutes at 350 degrees until golden brown. (I left them in for 10 minutes and took them out when they were still a little gooey in the middle, they will bake a bit more on the pan.) Makes about 3 dozen. Enjoy my lil' pumpkins!