Follow these simple steps to create your Soft Butter Cookies:

1. Preheat Oven: Begin by preheating your oven to 350°F (175°C). Line a baking sheet with parchment paper.
2. Cream Butter and Sugars: In a large bowl, cream together the softened butter, granulated sugar, and powdered sugar until light and fluffy.
3. Add Egg and Vanilla: Beat in the egg and vanilla extract until well combined.
4. Mix Dry Ingredients: In another bowl, whisk together the flour, baking soda, and salt.
5. Combine Mixtures: Gradually add the dry ingredients to the wet mixture, mixing until just combined. Be careful not to over-mix.
6. Scoop Dough: Using a cookie scoop or tablespoon, drop rounded balls of dough onto the prepared baking sheet, spacing them about 2 inches apart.
7. Bake: Place in the preheated oven and bake for 10-12 minutes, or until the edges are lightly golden.
8. Cool: Remove from the oven and let the cookies cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.

These steps will guide you in creating incredibly soft and delicious butter cookies that everyone will love!