White Chocolate Cupcakes with White Chocolate Cream Cheese Frosting

White Chocolate Cupcakes
0 Pre-heat oven to 400 Fahrenheit and line cupcake tins with cupcake liners.
1 Mix the dry ingredients in a medium-sized separate bowl, whisk for 1 minute to aerate them and set them aside.
2 Over a large bowl of a stand mixer with a paddle attachment (or hand mixer), cream unsalted butter and white sugar for 3 minutes in medium speed, until color turns into a lighter shade. Add vanilla extract and mix.
3 Add room temperature egg and egg whites, one by one, mixing after each addition.
4 Scrape the bottom and sides of the bowl with a rubber spatula, add the sour cream and mix until just combined.
5 Fold in flour mixture, alternating with milk, and mix until just incorporated. It's important that you don't over mix the batter at this point.
6 Fold in the white chocolate chips.
7 Divide cupcake batter into the cupcake liners, filling them 2/3 full. I used a 3 tablespoon ice cream scoop.
8 Bake cupcakes in pre-heated oven for 5 minutes. Then, lower the temperature to 350 Fahrenheit and bake for an additional 10-13 minutes, or until a toothpick inserted in the middle of the cupcake comes out clean.Let. cupcakes cool for a minute, then transfer to a wire rack to cook completely.
White Chocolate Cream Cheese frosting
11 Over a double boiler in the stove, or using a microwave-safe bowl -in 30 second intervals, melt white chocolate and set aside. See these tips on how to melt chocolate properly. Set aside to cool (It needs to be pourable but not hot to the touch)
12 Cream butter and cream cheese in medium speed for 1 minute. Turn speed to low and gradually, add the sifted powdered sugar, vanilla extract and salt. Mix until just combined.
13 Add the cooled melted chocolate and mix in medium speed until everything is well combined.If your frosting is too runny, refrigerate for 5 to 10 minutes to let the chocolate set, then beat again until reaching desired consistency.
14 Using a piping bag and a 4B tip, pipe a high swirl of white chocolate cream cheese frosting into the completely cooked cupcakes, and add a white chocolate truffle on top.