Creating Apple Cider Donut Muffins is straightforward if you follow these simple steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Grease or line a muffin tin with paper liners.
2. Mix Dry Ingredients: In a large bowl, whisk together the flour, baking powder, baking soda, cinnamon, nutmeg, and salt until well combined.
3. Combine Wet Ingredients: In another bowl, whisk together the melted butter, granulated sugar, eggs, and apple cider until smooth.
4. Combine Mixtures: Gradually add the wet ingredients to the dry ingredients, stirring until just combined. Be careful not to overmix; some lumps are okay.
5. Fill Muffin Cups: Spoon the batter into the prepared muffin tin, filling each cup about ¾ full.
6. Bake: Place in the preheated oven and bake for 20-25 minutes or until a toothpick inserted in the center comes out clean.
7. Cool: Remove from the oven and allow the muffins to cool in the tin for about 10 minutes before transferring them to a wire rack to cool completely.
8. Prepare Topping: While the muffins cool, mix the granulated sugar and cinnamon in a small bowl.
9. Coat Muffins: Once the muffins are slightly cooled, brush the tops with melted butter and dip them into the cinnamon-sugar mixture to coat.

These steps will guide you in creating these incredible muffins effortlessly.