Shortbread
(Dad's recipe)

2.5c flour
2 sticks butter, room temperature and gooey (1/2 lb)
0.75c sugar
0.5t salt

Mix dry ingredients, add to butter
Press into mold
Bake at 350 ˚F for 20-25 minutes
Cool slowly so cookies don't crack

Notes: Since you always forget to take out the butter early, put cold butter into a sauce pan on low-medium heat, and get it partially melted. Then add dry ingredients all at once. 
Prick holes with a fork before baking to prevent weird bubbling.
If don't have shortbread mold, tarte tatin pan works well.