Cinnamon Chip Biscoff Cookie Cake

butter, room temperature 1/4 cup creamy Biscoff spread 1/4 cup granulated sugar 1/3 cup brown sugar 1 egg 1 tsp. vanilla 1 1/4 cup flour 3/4 tsp. ground cinnamon 1/2 tsp. salt 1/2 tsp. cream of tartar 1/2 tsp. baking soda 1 (heaping) cup cinnamon chips