1 c. butter
1 c. canola oil
1 c. sugar
1 c. confectioners' sugar
2 eggs
1 tsp. vanilla
1 tsp. baking soda
1 tsp. salt
1 tsp. cream of tartar
4 1/2 c. plain flour

Combine butter, oil, and sugar in a large bowl, beat well. Add eggs and vanilla. Combine dry ingredients and add to above mixture. Shape dough into 1-inch balls. Place on ungreased cookie sheet. Flatten each ball with glass bottom that has been dipped in sugar. Bake 8-10 minutes at 350 degrees.