01 -
Preheat oven to 350°F (175°C) and line baking sheets with parchment paper.
02 -
In a large bowl, cream together 1 cup softened butter, 1 cup brown sugar, and ½ cup granulated sugar until light and fluffy.
03 -
Add eggs one at a time, mixing well after each addition, then stir in 1 tsp vanilla extract.
04 -
In a separate bowl, whisk together 1½ cups all-purpose flour, 1 tsp baking soda, 1 tsp ground cinnamon, ½ tsp ground nutmeg, and ½ tsp salt.
05 -
Gradually stir the dry ingredients into the wet mixture until just combined.
06 -
Fold in 1½ cups old-fashioned oats, 1 cup grated carrots, and optional walnuts or raisins.
07 -
Scoop tablespoon-sized dough balls onto prepared baking sheets, flatten slightly, and space 2 inches apart.
08 -
Bake for 10-12 minutes until edges are golden brown. Let cookies cool on sheets for 5 minutes before transferring to wire racks.
09 -
For the filling: Beat 8 oz cream cheese and ½ cup softened butter together until smooth. Gradually add 4 cups powdered sugar and 1 tsp vanilla extract, whipping until light and fluffy.
10 -
Spread cream filling on the flat side of half the cookies and top with the remaining cookies to create sandwich cookies.