Preheat the oven to 350°F (175°C) and line two baking sheets with parchment paper or a silicone baking mat.

In a large bowl, combine the oats, flour, baking powder, baking soda, salt, cinnamon, and nutmeg. Whisk until evenly distributed.

In a separate bowl, whisk together the brown sugar, maple syrup, oil, egg, vanilla, and applesauce until smooth.

Pour the wet mixture into the dry ingredients and stir until mostly combined. Fold in the grated carrots and your choice of nuts or dried fruit.

Use a tablespoon or small cookie scoop to drop rounded portions of dough onto the baking sheets, spacing them about 2 inches apart. Gently flatten each mound to about 1/2-inch thickness.

Bake for 11–13 minutes or until the edges are just golden and the centers are set.

Let the cookies cool on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely.