Preheat oven to 375 degrees. Line cookie sheet with parchment paper. Combine flour, baking soda, salt and cinnamon and set aside. Cream butter and brown sugar together in a large bowl, with a electric mixer for 2-3 minutes or until light and fluffy. Beat in egg and vanilla. Gradually add flour mixture and beat until well blended. Stir in oats and Decas berries. Drop by rounded teaspoon onto parchment lined cookie sheet. Bake for 10-12 minutes or until golden brown. Put on wire rack to cool.