For the dough, start by mixing your dry ingredients in a medium-sized bowl.
Add in the oil, honey, vanilla extract and continue to combine.
Separate the egg whites from the egg yolks (including your one extra egg yolk, you can discard the additional white)
Add in the egg yolks, and combine. Whisk the egg whites in a separate small bowl, until frothy.
Now, fold in the egg whites into the batter. Once everything is all mixed, place the dough in the fridge or freezer to firm up a bit while the cherry jam also cools down (two hours or so-- you can always prepare the dough or the jam, or both, a day prior, and then proceed to make your cookies).
Mix the cherry jam filling into the cookie dough and combine well.
Once the cherry jam is well-dispersed in the cookie dough, place a tablespoon of dough per cookie on a parchment paper-lined baking tray.
Flatten each cookie with the palm of your hand/wrist - make sure it's a little bit wet to avoid sticking to the cookie!
Bake the cookies in a preheated oven at 350 for 12-14 minutes. Allow to cool before moving the cookies as they will be delicate when soft-- once they cool, they will firm up. Store in fridge or freezer - they freeze well!