Preheat oven to 350°F. Grease baking sheets with parchment paper.
In a large bowl, mix the butter with a rubber scraper until it is light and soft. Add 1 cup of sugar and mix. Repeat with the remaining sugar.
Add egg, salt, and vanilla; mix to combine. Add flour bits by bits until it's fully mixed. The mixture should now be crumbly.
Press the dough with your hands and shape it into tablespoon balls. Place the balls onto the baking sheets, leaving 1 inch space for each. You may use a glass to flatten the cookies lightly.
Bake until the cookies’ edges start to brown, usually 10 minutes. Remove from oven and let rest for 2-3 minutes. Serve warm with milk!
