Preheat & Prep – Preheat oven to 350°F (175°C) and line a baking sheet with parchment paper.
Mix Wet Ingredients – Cream together butter, brown sugar, and granulated sugar until fluffy. Add eggs and vanilla, mixing well.
Combine Dry Ingredients – In another bowl, whisk together flour, baking soda, cinnamon, nutmeg, and salt.
Mix Dough – Slowly add dry ingredients to wet ingredients, then fold in carrots, walnuts, and raisins.
Bake – Scoop dough onto the baking sheet and bake for 10–12 minutes. Let cool.
Make Frosting – Beat together cream cheese, butter, powdered sugar, and vanilla until smooth.
Assemble Sandwiches – Pipe or spread frosting onto a cookie, then press another cookie on top.
Chill & Serve – Refrigerate for 15–20 minutes before serving. Enjoy!