Preheat the oven to 350°F (180° C). Line your baking sheet with parchment paper or a silicone baking mat. Set aside.
In the bowl of a stand mixer or with an electric hand mixer, cream together the sugar, margarine and butter until well combined.
1 1/4 cup (288g) granulated sugar , 1/2 cup (111g) salted butter, 1/2 cup (111g) margarine
Scrape the sides of the bowl and add in the egg, corn syrup, and vanilla extract. Mix until combined.
1 egg, 2 tbsp corn syrup, 1 tsp vanilla extract
Add the flour, baking soda and salt, mix until the dough forms.
2 1/2 cups (380g) all-purpose flour, 1/2 tsp baking soda, 1/2 tsp salt
Add the toffee bits to the dough and mix until evenly distributed.
8 oz bag toffee bits
Portion the dough out into your desired size. I like to use my #24 scoop that uses 3 tbsp of dough.
In a small bowl, combine the cinnamon sugar mixture.
1/4 cup (57.5g) granulated sugar, 1 1/2 tsp ground cinnamon
Roll each ball of dough into the cinnamon sugar, pressing the mixture onto the cookie dough. Repeat with remaining dough.
Bake at 350°F (180° C) for 11-13 minutes. The cookie will flatten, spread and the edges should start to turn golden brown when they are ready to come out of the oven.
Allow the cookies to cool on the pan for 5 minutes before transferring to a wire cooling rack.
Store in an airtight container at room temperature for up to 3 days or in the freezer for up to 3 months.