Preheat the oven to 375℉. Line a cookie sheet with parchment paper or a silicone baking mat.

In a mixing bowl, with the paddle attachment, beat thesoftned butter, white sugar and brown sugar until light and fluffy. This will take about 3 minutes. If you are using a handheld mixer it may take longer.

Beat in the eggs and vanilla extract until combined.

Add the flour, cream of tartar, baking soda, and salt. Beat until all of the flour is mixed in and no dry pockets of flour remain.

Fold in the rice cereal and chocolate chips with a sturdy spatula.

Portion the dough into ½ cup portions and place on a baking sheet. Bake for 12-15 minutes or until the cookies are no longer glossy on the top center.

Let cool completely on the baking sheet so they can continue to bake slightly after you remove them from the oven.