Start by preheating your oven to 375°F (190°C). Prepare a 12-cup muffin pan by lining it with paper liners or giving it a light greasing to prevent sticking.
In a large mixing bowl, sift together the all-purpose flour, baking powder, ground cinnamon, ground nutmeg, and salt. Use a whisk to blend the dry ingredients thoroughly for an even distribution of flavors.
In a separate mixing bowl, combine the brown sugar, granulated sugar, and vegetable oil, whisking until well blended. Add the egg and continue mixing until smooth. Then incorporate the vanilla extract, apple cider, and unsweetened applesauce, whisking again until the mixture is homogenous.
Gradually pour the wet mixture into the bowl of dry ingredients. Using a spatula or wooden spoon, stir gently until just combined. Avoid overmixing; it’s perfectly fine if some small lumps remain in the batter.
Gently fold in the shredded apple and, if desired, the chopped walnuts or pecans, until they are evenly dispersed throughout the batter.
Using a ladle or ice cream scoop, fill each muffin cup about two-thirds full with the batter, ensuring even distribution for uniform baking.
Place the muffin pan in the preheated oven and bake for 15-20 minutes. Check for doneness by inserting a toothpick into the center of a muffin; it should come out clean when they are ready.
After baking, let the muffins cool in the pan for about 5-7 minutes. Once slightly cooled, transfer them to a wire rack to cool completely and achieve the perfect texture.
Notes
Serve warm with a sprinkle of powdered sugar or a drizzle of honey.