First, add the vegan butter, brown sugar, and ½ cup of the cane sugar to a large mixing bowl. Then, cream together with an electric mixer until soft and fluffy.
Next, add in the peanut butter, flax egg, and vanilla and whip together for another minute.
Add the all-purpose flour, baking soda, and baking powder to the mixing bowl. If using unsalted peanut butter, this is also when you would add in the additional salt. Make sure to add the flour first and then add the other ingredients on top. Then, use the electic mixer to mix everything together until a thick cookie dough forms. The dough will be slightly sticky and easily to handle, but not dry.
Preheat the oven to 350F and line a baking tray with parchment paper. Then, fill a small bowl with the remaining ¼ cup of cane sugar.
Use a cookie scoop to scoop out 14 evenly sized cookies (about 45-50 grams per cookie). Roll into balls between your palms and then roll in the bowl of sugar until the cookies are coated.
Place each cookie dough ball onto the parchment-lined baking sheet making sure to leave the cookies 2-inches apart. All of the cookies will not fit on one baking sheet, so I recommend baking 9 cookies at a time on one tray vs. putting two trays in the oven at the same time. Make sure the cookies are about 2-inches apart as they will spread quite a bit while baking.
Bake the cookies for 11-13 minutes until the cookies are cooked through but have slightly soft centers (If making large cookies adjust baking time to 13-15 minutes). The cookies will continue baking after they are removed from the oven so the centers should still be soft, but not glossy or raw,, when they are removed from the oven.
As soon as you remove the tray of cookies from the oven immediately "bang" the tray of cookies on the counter to help the cookies deflate. This will also give them that desirably crackly texture.
Then, let the cookies cool on the baking sheet for 5 minutes. The cookies will continue to naturally deflate a little while cooling. After 5 minutes transfer the cookies to a wire rack to continue cooling. Once cooled, serve & enjoy!