Doughnut Muffins

Name: Doughnut Muffins
Ingredients: 12 tbsp Unsalted Butter; 3/4 cup Sugar (muffins); 2 x eggs (large) (muffins); 3 cup all-purpose flour (muffins); 2 1/2 tsp Baking Powder (muffins); 1/4 tsp Baking Soda (muffins); 3/4 tsp salt (muffins); 1/2 tsp Ground Nutmeg (muffins); 3/4 cup Whole Milk (muffins); 1/4 cup Buttermilk (muffins); 4 tbsp unsalted butter, melted for topping; 1 cup Granulated Sugar for topping; 1 tbsp cinnamon for topping