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1
Allow butter and eggs to stand at room temperature for 30 minutes.
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2
Meanwhile, grease and flour twenty-four 2-1/2-inch muffin cups (or line with paper bake cups).
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3
In a medium bowl stir together flour, baking powder, and salt.
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Set aside.
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5
Preheat oven to 350 degrees F. In a large mixing bowl beat butter with an electric mixer on medium to high speed for 30 seconds.
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6
Gradually add sugar, about 1/4 cup at a time, beating on medium speed until combined.
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Scrape sides of bowl; beat for 2 minutes more.
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Add eggs, one at a time, beating well after each addition.
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Beat in liqueur and vanilla.
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Alternately add flour mixture and milk, beating on low speed after each addition just until combined.
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11
Fold in nuts.
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Spoon batter into prepared muffin cups, filling each about three-fourths full.
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13
Use the back of a spoon to smooth out batter in cups.
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14
Bake for 15 to 18 minutes or until tops spring back when lightly touched.
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15
Cool cupcakes in muffin cups on wire racks for 5 minutes.
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16
Remove cupcakes from muffin cups.
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Cool completely on wire racks.
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18
For the buttercream: Allow butter to stand at room temperature for 30 minutes.
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19
In a large mixing bowl beat butter with an electric mixer on medium speed until smooth.
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20
Gradually add 1 cup of the powdered sugar, beating well.
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21
Beat in the 2 tablespoons milk, the liqueur, and vanilla.
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22
Gradually beat in the remaining powdered sugar.
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23
Beat in additional milk until buttercream reaches spreading consistency.
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24
For the Sugar drizzle: In a large skillet cook sugar over medium-high heat until sugar starts to melt, shaking skillet occasionally.
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Do not stir.
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When sugar starts to melt, reduce heat to low and cook about 5 minutes or until all of the sugar is melted, stirring as needed with a wooden spoon.
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27
Remove from heat.
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28
Immediately drizzle sugar mixture over frosted cupcakes.
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29
Spread Vanilla-Hazelnut Buttercream onto tops of cupcakes.
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30
Quickly drizzle with Caramelized Sugar Drizzle.
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31
If desired, sprinkle with nutmeg.