Added more flour than what the recipe calls for to make butter cookies
If you added too much flour, you could increase the rest of the ingredients, so that the ratios are more or less equal than in the original recipe.

In your case, in theory, you have about 125% flour, so you would need 125 gram of butter, about 4/5 cup of powdered sugar,  3⁄20 of vanilla extract and 3.75 egg yolks.
However in practice, I think you would be fine if you would leave the other ingredients as is, or if the egg yolks are rather small, add a fourth one. A small increase of sugar would work though.

Nevertheless, as your batter was in the fridge for three days, I would throw it out because of the egg yolks.