01 -
In the bowl of a stand mixer fitted with the paddle attachment (or large mixing bowl with hand mixer), combine the egg, butter, sugars, and vanilla. Beat on medium-high speed until light and fluffy, about 5 minutes.
02 -
Stop, scrape down the sides of the bowl, and add the cinnamon, allspice, nutmeg, cloves, and optional salt. Beat momentarily to incorporate.
03 -
Add the flour, oats, and baking soda, and beat until just combined, less than 1 minute.
04 -
Add the carrots and beat to incorporate, about 30 seconds. Then add the optional butterscotch chips and raisins, beating for about 30 seconds to incorporate.
05 -
Using a medium cookie scoop (about 2 tablespoons) or your hands, scoop out mounds of dough and place them on a large plate. Flatten mounds just slightly with heel of your hand. Cover plate with plastic wrap and refrigerate dough for at least 3 hours, up to 5 days, before baking.
06 -
Preheat oven to 350°F (175°C). Line 2 baking sheets with silicone baking mats or parchment paper. Space dough 2 inches apart (8 per tray) and bake for 9 to 11 minutes, or until tops have just set, even if slightly underbaked and glossy in the center.
07 -
Allow cookies to cool on the baking sheet for about 10 minutes before removing and transferring to a rack to finish cooling completely.