Preheat oven to 350°F (175°C) and line a baking sheet with parchment paper.
Mix strawberries with sugar, lemon juice, and cornstarch; let sit 20–30 minutes.
In a bowl, whisk flour, baking powder, baking soda, and salt.
In a separate bowl, beat butter, granulated sugar, and brown sugar until fluffy.
Add eggs one at a time, then mix in vanilla extract.
Stir in sour cream until smooth.
Gradually add dry ingredients and mix until just combined.
Scoop large cookie dough balls onto baking sheet and gently flatten.
Bake for 12–14 minutes until edges are lightly golden. Cool completely.
Beat cream cheese with powdered sugar and vanilla until smooth.
Whip heavy cream to soft peaks and fold into cream cheese mixture.
Mix crushed cookies with melted butter to form crumble.
Spread strawberry filling over cooled cookies.
Add frosting and top with cookie crumble. Serve immediately or chill.