Cut butter into small cubes, then cook in microwave at 15-second increments until melted.
Melt duck fat in microwave using 15-second increments until ready.
Mix flour, salt, and baking powder together in a separate bowl.
Mix all liquid ingredients together.
If your liquid ingredients bowl is hot enough to cook eggs, then hold off until it has cooled down.
Crack eggs and whisk into the liquid mixture.
Add both sugars to the liquid mixture, then stir together.
Slowly and incrementally add the flour mixture to the liquid mixture, stir it into the liquid ingredients.
Set in fridge for 30 minutes.
Preheat oven to 350.
Put parchment paper over the cookie sheets.
Make dough in to 1½ inch balls, at least 2 inches apart.
Bake for 12 minutes.
Let cookies sit for at least a half hour before handling.
