01 -
Grab a big bowl and toss in the flour, baking soda, salt, cinnamon, and cornstarch. Give it a good mix and set it aside for now.
02 -
Use a medium-sized bowl to whisk the melted butter with the brown sugar until it’s smooth. Mix in the egg thoroughly, then finish by adding the vanilla until it's all blended nicely.
03 -
Mix the wet blend into the dry mixture using a spatula or big spoon. It'll be thick but soft. Cover it up and chill in the fridge at least 2 hours—don’t skip this step!
04 -
Set your oven to 325°F (163°C). Prepare two baking sheets with either silicone mats or parchment paper now. If the dough has been in the fridge past two hours, leave it on the counter for 10 minutes to soften a bit.
05 -
Scoop about 2 tablespoons of dough and make into balls. Roll each one in the white sugar until covered. Put them at least 3 inches apart on your baking sheets.
06 -
Pop them in the oven for 8-9 minutes first, then pull them out and press the tops gently to make a crinkly look. Bake for 2-4 more minutes. The middles should look soft and puffed. Let them rest on the baking sheet for 10 minutes, then cool fully on a wire rack.