Prepare the dry ingredients: In a medium bowl, whisk together the flour, baking soda, and salt.
Cream the butter and sugar: In a large bowl, beat the butter and sugar until light and fluffy.
Add the egg and vanilla: Beat in the egg and vanilla extract until well combined.
Combine dry and wet ingredients: Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
Prepare the strawberries: Pat the diced strawberries dry with paper towels and toss them with 1 tablespoon of flour.
Fold in strawberries: Gently fold the floured strawberries into the dough, ensuring even distribution without breaking them up.
Chill the dough: Wrap the dough in plastic wrap and refrigerate for at least 1 hour.
Preheat the oven: Preheat your oven to 350°F (175°C) and line baking sheets with parchment paper.
Shape the cookies: Roll the dough into 1-inch balls and place them 2 inches apart on the prepared baking sheets. Flatten each ball slightly with the bottom of a glass.
Bake: Bake for 8-10 minutes, or until the edges are set but the centers are still soft.
Cool: Allow the cookies to cool on the baking sheets for 5 minutes before transferring them to a wire rack to cool completely.