Hi,
For cupcakes, I also wouldn't use royal icing. I either make chocolate or buttercream frosting.
Here are my recipes for vanilla cupcakes and frosting - easy to make and no unusual ingredients required:
CUPCAKES:
1 cup (8 oz.) unsalted butter, softened
2 cups sugar
4 large eggs, at room temperature
1 1/2 cups self-rising flour*
1 1/4 cups all-purpose flour
1 cup milk
1 tsp. vanilla extract
BUTTERCREAM FROSTING
6 Tbsps. all-purpose flour
2 C. milk
2 C. (16 oz.) unsalted butter, softened
2 C. icing sugar
2 tsp. vanilla extract
*to make your own self-rising flour, combine 1 cup of all-purpose flour,
1 1/4 tsps. baking powder, 1/8 tsp. salt. Yield: 1 cup self-rising flour
CAKE:
Preheat oven to 350 degrees (175 C). Line two 12-cup muffin tins with cupcake papers. Combine the flours and set aside.
In a large bowl, on the medium speed of an electric mixer, cream the butter until smooth. Add the sugar gradually and beat until fluffy, about 3 minutes. Add the eggs, one at a time, beating well after each addition. Add the dry ingredients in three parts alternating with the milk and vanilla. With each addition, beat until the ingredients are incorporated but do not overbeat. Using a rubber spatula, scrap down the batter in the bowl to make sure the ingredients are well blended. Carefully spoon the batter into the cupcake liners, filling them about three-quarters full. bake for 20 - 25 minutes, or until a cake tester inserted into the center of the cupcake comes out clean.
Let cakes cool in the pans for 15 minutes. Remove from pans and cool completely on wire rack before icing.
ICING:
To make the icing: In a medium-sized saucepan, whisk the flour into the milk until smooth. Place over medium heat and, stirring constantly, cook until the mixture becomes very thick and begins to bubble, 10-15 minutes. cover with waxed paper placed directly on the surface and cool to room temperature, about 30 minutes.
In a large bowl, on the medium-high speed of an electric mixer, beat the butter for 3 minutes, until smooth and creamy. Gradually add the sugar, beating continuously for 3 minutes until fluffy. Add the vanilla and beat well.
Add the cooled milk mixture and continue to beat on the medium-high speed for 5 minutes, until very smooth and noticeably whiter in color ((f desired, add a few drops of food coloring and mix thoroughly.) Cover and refrigerate for 15 minutes (no less and no longer -- set a timer! Use immediately.
This recipe yields @ 24 cupcakes. Enjoy!