01 -
Set oven to 350°F. Get baking sheets ready with parchment paper.
02 -
Stir together the flour, salt, baking soda, and baking powder until everything's blended.
03 -
Whip up the butter and sugar for about 2 minutes. It should look fluffy. Then mix in the egg, yolk, and vanilla.
04 -
Slowly mix the dry stuff into the wet mixture. Keep the mixer on low so you don't overdo it.
05 -
Scoop out 1-inch dough balls. Roll them in sugar if you like, and space them 3 inches apart on the sheets.
06 -
Pop one tray at a time in the oven for about 8 to 9 minutes. The tops should just set—don’t leave them too long.