01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together flour, cinnamon, ginger, nutmeg, baking soda, baking powder, and salt until well blended.
03 - In a large bowl, beat the softened butter, brown sugar, and granulated sugar until light and fluffy, approximately 2-3 minutes.
04 - Beat in the egg and vanilla extract until fully incorporated.
05 - Stir in the grated carrots until evenly distributed throughout the batter.
06 - Gradually add the dry ingredients to the wet mixture, mixing on low speed until just combined. Avoid overmixing.
07 - Gently fold in the rolled oats, nuts, and raisins by hand until evenly distributed.
08 - Drop tablespoon-sized mounds of dough onto the prepared baking sheets, spacing 2 inches apart to allow for spreading.
09 - Bake for 11-13 minutes until edges are lightly golden and centers are set. Cool on baking sheet for 5 minutes before transferring to wire rack.
10 - Beat cream cheese and softened butter together until smooth. Add powdered sugar, vanilla, and salt; beat until fluffy and well combined.
11 - Once cookies have cooled completely, spread or pipe frosting onto each cookie as desired.