In a large bowl, beat 1 cup butter and 4 tablespoons brown sugar until creamy and smooth.
Add ½ teaspoon vanilla extractt and beat well.
Add 2 cups all-purpose flour in 2 parts, and then ¾ cup ground pecanss. Mix just until smooth. I use a spatula.
Gather into a ball, cover in plastic wrap and chill or refrigerate for at least 3 hours.
Preheat oven to 350ºF (180°C).
Line a cookie sheet with parchment paper.
Roll portions of cold dough between your palms to form balls.
Place 1 inch apart on the lined baking sheet and flatten them slightly.
Bake for 15-18 minutes, depending on the thickness until they are a bit golden and slightly cracked.
Let cool on a wire rack.
Place ½ cup powdered sugar in a shallow bowl and roll the cookies to coat. Don't skip this step, as it adds an extra sweetness that is needed, as pecans can have a bitter tone sometimes.
These cookies freeze well unbaked. When you need them, line them up on a parchment-lined or greased baking tray, thaw, and bake.
Test run: I always recommend baking a couple of cookies first to check the temperature and baking time. All ovens are different, and the dough's temperature is also a variable, so you might need more or less time.