In a standard mixing bowl, commence by incorporating the softened butter. Using a mixer, beat the butter until it attains a light and creamy texture, approximately for three minutes.

Subsequently, integrate the sweetened condensed milk with the butter mixture. Beat this amalgamation for a further two minutes. If there's any optional extract being utilized for flavor enhancement, it should be added at this juncture, ensuring it does not exceed 2 teaspoons.

Scrape the sides of the bowl to ensure uniform consistency, then continue the beating process for another minute.

Gradually introduce the all-purpose flour and baking powder to the mixture. Ensure a smooth and even blend by beating until all components are thoroughly combined. If there's a desire to incorporate additional elements such as chocolate chips or cranberries, they should be added now, ensuring the quantity does not exceed 1 cup.

Use a standard cookie scoop to portion the dough. Place these portions onto a baking sheet lined with parchment paper. It is crucial to ensure a minimum of two inches between each dough portion to avoid merging during the baking process.

Bake the dough in a preheated oven at a temperature of 320°F for a precise 12-minute duration.

Once baked, remove the cookies from the oven and allow them to cool slightly on the baking sheet for a duration of five minutes.

Carefully transfer the cookies to a wire rack for further cooling. Once the cookies have adequately cooled, sift the confectioner’s sugar over them for a refined finish. It's essential to ensure the cookies are completely cooled before they are stored.