Combine the dry ingredients. In a medium bowl, whisk together the flour, baking powder, and salt.
Beat the eggs. In a large bowl with a hand mixer, or the bowl of a stand mixer fitted with the whisk attachment, beat the eggs, sugar, and lemon zest on medium-high speed until pale and doubled in volume, about 3 minutes.
Add the wet ingredients. While continuing to beat the eggs on medium-high speed, pour in the olive oil in a slow, steady stream. Pour in the milk and vanilla extract, and mix on low until incorporated.
Fold in the dry ingredients. Add the flour mixture and carefully fold with a rubber spatula until the mixture is combined and no dry lumps of flour remain, making sure to scrape the bottom and sides of the bowl.
Chill the batter. Cover the bowl and let it rest in the refrigerator for 1 hour.
Get ready to bake. About 20 minutes before the muffin batter is done resting, preheat the oven to 425°F. Line a standard muffin pan with muffin tin liners.
Divide the batter. Scoop or pour the batter into the prepared muffin pan, dividing it evenly among the 12 wells. Sprinkle the top of each muffin with a pinch of granulated sugar.
Bake the muffins. Set the muffin pan in the oven and reduce the oven temperature to 400°F. Bake for 18 to 20 minutes, or until a toothpick inserted into the center of a muffin comes out clean.
Cool and serve. Let the muffins cool in the pan for 10 minutes, then turn them out onto a wire rack to cool before serving. Serve warm or at room temperature. The muffins will keep in an airtight container for up to 4 days.
Notes
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