Preheat oven to 350 degrees. Grease a muffin tin with the nonstick cooking spray.
Combine flour, baking powder, salt, 1 teaspoon cinammon and 1 teaspoon nutmeg, whisk to combine and set aside.
In a stand mixer, cream 10 tablespoons butter, brown sugar and 1/4 cup of the granulated sugar on medium speed until light and fluffy, about 3-4 minutes.
Add the eggs individually and mix until incorporated. Add the vanilla extract.
While still mixing add the flour mixture on low speed until mixed together. Add apple cider slowly until it is combined. Make sure everything is mixed together well.
Add the batter to the muffin tins about 2/3 ways full.
Bake for 15-20 minutes, rotating halfway through baking.
While baking, whisk 1/2 cups granulated sugar and 1 teaspoon cinnamon together in a small bowl. In another bowl melt 6 tablespoons butter.
After the muffins have cooled for 5 minutes, brush them with melted butter and roll them in cinnamon sugar while still warm.