Preheat a waffle iron to the highest setting.
In a small bowl, whisk together flour and baking powder and set aside. In a medium bowl, combine sugar, sea salt, and nutmeg. Add melted butter, and then stir in honey, egg, and vanilla extract until combined. Whisk in the buttermilk. Add the flour mixture to the wet ingredients and stir until combined and smooth.
Scoop the batter onto the hot waffle iron (about 1/8–1/4 cup per doughnut) and cook according to the waffle maker’s instructions.
Allow doughnuts to cool slightly on a rack, then dust with confectioners’ sugar, or dip in glaze
In large bowl, whisk together powdered sugar, milk, and vanilla until combined. Add the cocoa to make a chocolate glaze. Dunk one side of the waffle doughnuts into the glaze and top with sprinkles, if desired.