The lemon raspberry combo on this cookie is pure spring magic! Tangy lemon cookie with marbled lemon-raspberry frosting infused with fresh raspberry jam, topped with a zesty lemon slice.
Cream together 1 cup unsalted butter, 1.5 cups granulated sugar, and 2 oz softened cream cheese in a stand mixer on medium speed until very light and fluffy, 3–4 minutes. This extended creaming mimics Crumbl’s tender crumb.
Add 2 large eggs, one at a time, beating well after each; mix in 2 tbsp lemon zest, 3 tbsp fresh lemon juice, and 2 tsp vanilla extract until fully combined. For the signature color, mix in 4 drops yellow food coloring if using.
Whisk together 3.25 cups all-purpose flour, 2 tbsp cornstarch, 1.5 tsp baking powder, 0.5 tsp baking soda, and 0.5 tsp kosher salt. Add dry ingredients to wet and mix on low just until a soft dough forms—do not overmix. Cornstarch and cream cheese replicate Crumbl’s soft, thick cookie center.
Portion dough into 8 oversized balls (~4.5 oz each), roll gently, and slightly flatten into thick pucks (about 1" tall, 3–4" wide). Chill dough on baking sheet for 1 hour—this prevents spreading and creates Crumbl’s signature thickness.
Bake at 350°F (175°C) for 15–18 minutes until edges are just set but centers look slightly underbaked. Do not overbake—Crumbl cookies are best soft. Cool completely on the sheet.
Make the frosting: Beat 0.5 cup unsalted butter and 4 oz cream cheese until smooth. Gradually add 2.5 cups powdered sugar on low, then increase speed. Mix in 2 tbsp lemon juice for a tart, creamy base.
Gently swirl 3 tbsp seedless raspberry jam into half the frosting to create a marbled look. Frost fully cooled cookies with a thick layer, marbling lemon and raspberry frostings together for that signature Crumbl look.
Top each cookie with a fresh lemon slice just before serving. For best texture, store cookies chilled and serve at room temp.