01 -
Preheat oven to 175°C. Line two baking sheets with parchment paper and set aside.
02 -
In a medium bowl, whisk together flour, cream of tartar, baking soda, and salt until evenly mixed.
03 -
Using an electric mixer on medium speed, beat butter, granulated sugar, and brown sugar until light and fluffy, approximately 2 to 3 minutes. Scrape bowl sides and bottom and mix briefly again.
04 -
Reduce mixer speed to low. Add eggs one at a time, then vanilla extract, mixing until fully combined.
05 -
Gradually add dry ingredients into wet ingredients, mixing until approximately half combined. Fold in toffee bits, continuing until no flour streaks remain.
06 -
In a small bowl, stir together granulated sugar and ground cinnamon.
07 -
Portion dough into 22 ml (1.5 tablespoon) balls. Roll each ball thoroughly in cinnamon sugar to coat all sides.
08 -
Place coated balls on prepared baking sheets spaced 5 cm apart. Bake for 8 to 10 minutes, until edges are set and tops appear slightly puffed.
09 -
Allow cookies to cool on baking sheets for 5 minutes before transferring to a wire rack to cool completely.