Preheat oven to 375 degrees and line 3 baking sheets with parchment paper.
In a medium size bowl, whisk together the cake flour, baking soda, baking powder, and sea salt. Set aside.
In a large mixing bowl, with an electric mixer on medium speed, cream shortening, sugar, and powdered sugar together for 2-3 minutes until smooth, light, and fluffy.
Add egg and vanilla extract and continue mixing for another minute, just until the egg is combined.
Gradually add the flour to the wet ingredients in batches and mix until just blended. Do not over-mix.
Using a 4 TBS cookie scoop, scoop the dough and roll into a ball with your hands. Roll each ball in sugar and place on the cookie sheet at least 2 inches apart. Carefully flatten each cooke with the bottom of a glass or your palm.
Bake cookies for 9 minutes at 375 degrees, rotating the pans halfway through to ensure even baking.
Let cookies cool on the baking sheet for a few minutes before transferring to a wire rack to cool completely. Store in an airtight container for 2-3 days or freeze for up to 3 months.
Notes
*Make sure to read the cookie baking tips to get answers to common questions about baking cookies.**These cookies are fragile and dry out quickly. If you're not going to eat them all within a day or two, pop them in a Ziplock bag and freeze them. You can pull one or two out at a time and they'll be almost as fresh as the day they were baked.