Make Carrot Cake Cupcakes with moist spiced batter and silky cream cheese frosting; bake, cool, and frost for a delicious treat.
Preheat the oven to 350°F and line two standard muffin tins with paper liners so you’re ready to bake. Arrange the lined tins on the painted pine wood surface and set aside; they should sit evenly and be waiting to be filled once the batter is ready.
In a mixing bowl, combine granulated sugar, vegetable oil, vanilla extract, and the room-temperature eggs. Beat briefly on medium-low speed until the mixture becomes slightly paler and cohesive, glossy with tiny air bubbles—about a few minutes—so the batter will be light and tender.
In a separate bowl, sift together the all-purpose flour, ground cinnamon, nutmeg, baking soda, and kosher salt. The dry mix should smell warmly spiced and feel fine and powdery, with the cinnamon and nutmeg evenly distributed through the flour.
With the mixer on low, add the sifted dry ingredients to the wet mixture a bit at a time, mixing just until combined. Stop as soon as the flour streaks disappear—overmixing will tighten the crumb—so the batter remains soft, slightly thick, and ready to accept the add-ins.
Continuing on low, fold in the roughly chopped walnuts, finely grated carrots, and the drained crushed pineapple until evenly distributed: orange carrot strands, walnut chunks, and tiny pineapple pieces should be visible against the warm batter. Scoop the batter into the prepared liners, filling each cup about three-quarters full so they rise evenly when baked.

Bake the filled muffin tins until the cupcakes are golden brown and a toothpick comes out clean, then transfer the tins to a wire rack to cool for a few minutes before carefully removing the cupcakes to cool completely. Allow them to cool fully so the frosting will hold its shape when applied.
In a clean mixing bowl, beat room-temperature cream cheese, butter, and vanilla until smooth and fully combined. Add the confectioners' sugar one cup at a time, beating until the frosting is light, creamy, and spreadable—velvety white with a faint glossy sheen.
Pipe or spread a generous swirl of cream cheese frosting onto the cooled cupcakes, then top with a scatter of finely chopped walnuts. Present a cupcake with the liner gently peeled back to reveal the tender, moist crumb studded with carrot and spice, garnished with extra walnut pieces nearby.
