Preheat oven to 350ºF.
In a large bowl beat sugar, butter, and light brown sugar, with an electric mixer, until light and fluffy; Beat in egg.
In a medium bowl combine flour, oats, cream of tartar, baking soda and salt; blend flour mixture into butter mixture. Stir in semi-sweet baking chips, rice cereal, and pecans. Drop by heaping tablespoonfuls about 2” apart onto ungreased cookie sheets. Bake 10-14 minutes or until lightly browned. Cool on wire racks.
Store in airtight container.