These Cinnamon Sugar Donut Muffins, reminiscent of a cinnamon-sugar donut, are the perfect blend of a delectable treat and an easy-to-make recipe, perfect for sharing and satisfying your sweet cravings.
Preheat oven to 375°F and coat a standard 12-cup muffin pan with nonstick vegetable oil spray.
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In a medium bowl, whisk together flour, baking powder, kosher salt, and ground nutmeg. Set aside.
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Using an electric mixer, beat the room temperature unsalted butter and 3/4 cup sugar in a large bowl until light and fluffy, about 4 minutes.
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Beat in the large egg.
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With the mixer on low speed, add the dry ingredients in 3 additions, alternating with the whole milk in 2 additions, beginning and ending with the dry ingredients.
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Divide the batter among the muffin cups and bake, rotating the pan halfway through, until a tester inserted into the center comes out clean, 30–35 minutes.
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Allow the muffins to cool for 5 minutes in the pan before transferring them to a wire rack.
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Prepare the topping by mixing 1/2 cup sugar and 1 teaspoon ground cinnamon in a medium bowl.
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Working one at a time, dip the tops of the muffins in the melted unsalted butter, then coat them with the cinnamon sugar mixture.
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If not serving immediately, muffins can be stored tightly wrapped at room temperature for up to 6 hours.