Eggnog Cupcakes with Spiced Rum Buttercream

I found this recipe off www.bakersroyale.com.  At the time it was the Christmas season and I was feeling festive!  These turned out really good!  Great flavor and not too overpowering.  And so pretty!  I used yellow glass sprinkles on top.

Eggnog Cupcakes with Spiced Rum Buttercream

Cupcakes:

• 1 1/2 cups self-rising flour
• 1 1/4 cups all-purpose flour
• 1 cup (2 sticks) unsalted butter, softened
• 2 cups sugar
• 4 large eggs, at room temperature
• ¾ cup eggnog
• ¼ cup milk
• 1 teaspoon vanilla extract

Spiced Rum Buttercream:

• 5 large egg whites
• 11/2 cup sugar
• 4 sticks unsalted butter, diced and softened
• 1/4 teaspoon salt
• ½ cup spiced rum

To make cupcake:

1. Measure out flour and set aside.
2. Add sugar and butter in a bowl and cream on medium speed until fluffy, about 3 minutes. Add eggs in 1 at a time, beating well after each addition. Add the dry ingredients in 3 parts, alternating with the eggnog and vanilla to start. Mix after addition until incorporated-do not overbeat.
3. Fill cupcake liners about 3/4 full and bake for 20 to 25 minutes. Transfer cupcakes from tins to cooling rack. Allow cupcakes to cool completely before frosting.

 To make Spice Rum Buttercream:

1. Combine egg whites and sugar in a bowl placed over simmering water. Bring mixture to 150 degrees F while whisking constantly.
2. Transfer mixture to stand mixer bowl, fitted with a whisk attachment and beat on medium  high speed (speed 8 on a KitchenAid stand mixer) until mixture cools and doubles in volume and forms soft medium peaks; about 10-12 minutes).
3. Add butter in one piece at a time, mixing to incorporate after each addition. The mixture may appear clumpy and almost curdled looking at first-this is normal. Keep mixing and it will become even and smooth again.
4. Add salt and spiced rum and mix to combine.