Heat oven to 350 degrees F. Cream together butter and sugars. Add eggs and vanilla; beat well. Add combined flour, Rumford Baking Powder, baking soda, cinnamon, nutmeg, allspice and salt; mix well. Stir in oats; mix well. Drop by rounded tablespoonfuls onto greased cookie sheets. Bake 10- 12 minutes or until golden brown. Cool 1 minute on cookie sheet; remove to wire rack.
Yield: about 4 dozen