Preheat your oven to 350°F (175°C). Grease a 9x13-inch baking dish or line it with parchment.
In a large bowl, whisk together the flour, baking soda, salt, cinnamon, cloves, and nutmeg.
In a separate bowl, cream the butter and sugar until light and fluffy. Add the egg and beat until combined.
Stir in the applesauce. (Don't worry if it looks a little curdled—it’ll bake up beautifully.)
Add the dry ingredients to the wet and mix until just combined.
Fold in raisins and nuts, if using. No need to be fancy—just stir until they’re spread out.
Pour the batter into the prepared pan and smooth the top.
Bake for 40 to 45 minutes, or until a toothpick comes out clean.
Let cool in the pan for a bit. Slice and enjoy plain or with a dollop of whipped cream!