01 - Preheat oven to 350°F. Line two baking sheets with parchment paper and set aside.
02 - In a large bowl, beat softened butter and granulated sugar together until light and fluffy, approximately 2-3 minutes.
03 - Mix in egg and vanilla extract until fully incorporated into the butter mixture.
04 - In a separate bowl, whisk together all-purpose flour, baking powder, and salt until well blended.
05 - Gradually add dry ingredients to wet mixture, mixing until just combined. Avoid overmixing to maintain tender texture.
06 - Gently fold diced strawberries and strawberry jam into dough until evenly distributed throughout.
07 - Drop tablespoon-sized dough balls onto prepared baking sheets, leaving 2 inches of space between each cookie to allow for spreading.
08 - Bake for 11-13 minutes until edges begin to turn golden brown while centers remain slightly soft.
09 - Remove from oven and immediately press one chocolate kiss into the center of each warm cookie while still on baking sheet.
10 - Let cookies rest on baking sheet for 5 minutes to set, then transfer to wire rack to cool completely before serving or storing.