Easy Doughnut Puffs
1 egg 1 tablespoon ground cinnamon, or more to tast… 1 teaspoon ground nutmeg, or more to taste 1 ½ teaspoons baking powder 1 ¾ cups all-purpose flour cooking spray ¼ cup butter, melted, or more to taste ½ teaspoon ground cinnamon ½ teaspoon ground nutmeg ½ teaspoon salt ¾ cup milk ¾ cup white sugar ⅓ cup vegetable oil ⅓ cup white sugar, or more to taste