Your cookies will stay delicious kept at room temperature for up to 9 days from the baking date and are at their best the first 2-4 days.
For a "fresh from the oven" effect why not reheat your cookies in a warm oven for 5 minutes...now you're getting the total #foodporn experience!
Cookies don't like the microwave but if you have no other option I recommend to use it for no more that 15 seconds at 750W.
Please note that the texture of Le Spread will vary depending on the room temperature - runny when hot and a set during cooler days.
If your spread hardens, simply soak the jar for 3min in a bowl full of very hot water or get a chunk out and let it melt on your porridge or toast!