In a large bowl, whisk together flour, cornstarch, baking soda, salt, and spices. Set aside.
270 g all-purpose flour, 1 teaspoon cornstarch, 2 teaspoons baking soda, 1/2 teaspoon salt, 2 teaspoons ground ginger, 1 teaspoon cinnamon, 1/2 teaspoon ground cloves
In the bowl of a stand mixer, combine butter and brown sugar. Mix on medium high until mixture is light and fluffy, about 5-6 minutes, scraping down the sides of the bowl as needed.
113 g unsalted butter, 160 g brown sugar
Add egg and molasses, mix until combined.
1 egg, 1/2 cup unsulphured molasses
Add flour mixture, mix on low until just incorporated. Scrap the edges of the bowl as needed. Do not over mix.
Cover with plastic wrap and refrigerate for at least 2 hours or overnight.
When ready to bake, preheat oven to 350°F and line two baking sheets with parchment paper.
Using a standard cookie scoop, scoop a double amount of cookie dough to make jumbo cookies. Using your hands, roll the two scoops together into one ball.
Roll in each cookie in granulated sugar before placing on baking sheet with at least 2" of space in between. Chill again for 20-30 minutes before baking for thicker cookies.
Granulated sugar for coating
Bake for 18-20 minutes until edges are set but center is still soft. Rotate pans half way through baking as needed.