This cookie captured pure spring nostalgia! The vanilla cake base holds clouds of fresh whipped cream and bright strawberry jam while real strawberry slices add bursts of juicy sweetness in every bite.
Cream the softened butter, cream cheese, granulated sugar, and brown sugar in a stand mixer on medium-high for 3 minutes until light and fluffy. This high fat-to-flour ratio and extra creaming is key for plush, bakery-style centers.
Add the eggs one at a time, mixing until fully incorporated and scraping the bowl. Blend in vanilla extract. Meanwhile, whisk together both flours, cornstarch, baking powder, and kosher salt in a separate bowl.
Gradually add the dry ingredients into the wet mixture on low speed, mixing until just combined. The dough will be thick and slightly sticky; do not overmix.
Portion dough into 8 extra-large balls (about 4.5 oz each), flatten slightly to 1-inch thickness, and chill on a parchment-lined tray uncovered for at least 1 hour. Copycat tip: Chilling gives Crumbl-style thickness and prevents spreading.
Preheat oven to 350°F (175°C). Bake chilled cookies spaced apart on parchment for 13–15 minutes. The edges should look set but the centers still soft and pale; do not overbake—Crumbl's signature texture is a soft, thick cookie.
Cool cookies completely on the baking sheet, then transfer to a rack. Whip the heavy cream and powdered sugar to stiff peaks just before topping.
Spread a generous swirl of whipped cream over each cooled cookie, spoon a dollop of strawberry jam, and softly marble it with the back of a spoon. Top with fresh sliced strawberries for juicy bursts and serve immediately.