Preheat the Oven and Prepare the Baking Sheet:
Preheat your oven to 350°F (175°C). Line a baking sheet with parchment paper or lightly grease it.
Prepare the Strawberries:
Hull the fresh strawberries and chop them into small pieces.
For a smoother texture, you can also mash the strawberries with a fork to make a puree. If you use puree, you may want to reduce the amount of sugar slightly, as the strawberries will add sweetness.
Mix the Dry Ingredients:
In a medium bowl, whisk together the flour, baking soda, baking powder, and salt. Set aside.
Cream the Butter and Sugar:
In a large bowl, use an electric mixer to cream the softened butter and sugar together until the mixture is light and fluffy, about 3 minutes.
Add the egg, vanilla extract, and strawberry puree (if using), and beat until fully combined.
Combine Wet and Dry Ingredients:
Gradually add the dry ingredients to the wet ingredients and mix until just combined. Be careful not to overmix.
Add Strawberries:
Gently fold the chopped strawberries into the dough, making sure they are evenly distributed throughout the mixture.
Shape the Dough:
Using a spoon or cookie scoop, form dough balls, about 1 inch in size. Roll each dough ball in granulated sugar to coat them evenly.
Bake the Cookies:
Place the dough balls on the prepared baking sheet about 2 inches apart.
Flatten each dough ball slightly with the back of a spoon or your fingers.
Bake for 8-10 minutes, or until the edges of the cookies are golden brown and the centers are set. The cookies should look soft in the middle but firm up as they cool.
Cool the Cookies:
Remove the cookies from the oven and let them cool on the baking sheet for a few minutes before transferring them to a wire rack to cool completely.