01 -
Preheat oven to 350°F (175°C). Line a baking sheet with parchment paper or lightly coat with nonstick cooking spray if needed.
02 -
In a large mixing bowl, beat the granulated sugar and unsalted butter together with a hand or stand mixer until light and smooth.
03 -
Add egg yolks and vanilla extract to the butter-sugar mixture. Mix until just combined.
04 -
In a separate bowl, blend together all-purpose flour, salt, baking soda, and cream of tartar.
05 -
Gradually add the dry ingredients to the wet mixture, mixing until a uniform dough forms. Gently fold in diced strawberries.
06 -
Scoop dough onto the prepared baking sheet using rounded tablespoons, spacing evenly. Bake in preheated oven for 12-15 minutes or until edges turn golden. Allow cookies to cool completely on a wire rack.
07 -
In a food processor or blender, purée 1 cup diced strawberries until smooth. Add softened butter, corn syrup, and extract; process until combined. Blend in powdered sugar gradually, pulsing until a thick, smooth frosting forms.
08 -
Once cookies are fully cooled, evenly spread or pipe strawberry frosting on top of each cookie. Let set at room temperature before serving.