Libby's Great Pumpkin Cookies

1 1/2 cup butter (softened)
2 cups brown sugar (packed)
1 egg
1 tsp. vanilla extract
1 16 oz. can solid packed pumpkin
4 cups flour
2 cups oats
2 tsp. baking soda
2 tsp. ground cinnamon
1 tsp. salt
Chocolate chips (can add if want to)

Preheat oven to 350. Combine flour, oats, baking soda, cinnamon and salt; set aside. Cream butter; gradually add sugars, beating until light and fluffy. Add eggs and vanilla; mix well. For each cookie, drop 1/4 cup dough onto lightly greased cookie sheet.
Bake at 350 for 20-25 minutes.