Finely chop strawberries and blot with paper towels to remove excess moisture.
In a bowl, cream together butter, granulated sugar, and brown sugar until light and fluffy.
Add egg and vanilla extract, mixing until combined.
In a separate bowl, whisk together flour, baking powder, and salt.
Gradually add dry ingredients to wet ingredients and mix until just combined.
Gently fold in the chopped strawberries.
Scoop dough onto a lined baking sheet, leaving space between each cookie.
Bake at 350°F (175°C) for 10 to 12 minutes until edges are set and centers remain soft.
Let cool on the baking sheet for a few minutes, then transfer to a wire rack.