Preheat your oven to 375°F (190°C) and line a baking sheet with parchment paper.
In a mixing bowl, whisk together the flour, baking powder, and salt.
Add the cold, cubed butter to the flour mixture and cut it in until the mixture resembles coarse crumbs.
In another bowl, beat together the sugar, egg, and vanilla extract until well combined.
Gradually add the wet ingredients to the dry ingredients, mixing until just combined.
Gently fold in the diced strawberries.
Drop spoonfuls of dough onto the prepared baking sheet, spacing them about 2 inches apart.
Bake for 12-15 minutes, or until the edges are golden brown.
Allow the cookies to cool on the baking sheet for a few minutes before transferring to a wire rack to cool completely.