Preparation Steps

• Preheat your oven to 375°F (190°C). Grease and flour a donut pan or line with parchment paper.
• In a large bowl, whisk together the flour, sugar, baking powder, cinnamon, nutmeg, and salt.
• In a separate bowl, whisk together the egg, milk, and melted butter.
• Pour the wet ingredients into the dry ingredients and mix until just combined. Do not overmix.
• Gently fold in the diced apple.
• Spoon or pipe the batter into the prepared donut pan, filling each cavity about two-thirds full.
• Bake for 12-15 minutes, or until a toothpick inserted into the center of a donut comes out clean.
• While the donuts are baking, prepare the topping by melting the butter in a small bowl. Stir in the sugar and cinnamon until well combined.
• Once the donuts are baked, let them cool in the pan for a few minutes before transferring them to a wire rack to cool completely.
• Dip the tops of the cooled donuts into the cinnamon-sugar mixture.