Triple chocolate cupcake recipe

This weekend I tried baking triple chocolate cupcakes for my friend
They tasted fabulous!!! If i made them again I would spend more time on the frosting to make sure it is the way I like. My family will eat anything but I try to make them the best I can!!
Here is the recipe it's worth a try-
FOR THE CUPCAKES:
2/3 cup butter
1 3/4 cup brown sugar
3 eggs
1/4 cup sour cream
1 cup milk
1 1/4 cup cocoa powder
1 1/4 cup flour
3/4 teaspoon baking powder
1/4 teaspoon baking soda
1/4 teaspoon salt

FOR THE DARK FUDGE FILLING:
1 1/2 cups dark chocolate chips
1 cup heavy whipping cream
1 teaspoon vanilla

FOR THE WHITE CHOCOLATE FROSTING:
1 cup white chocolate chips
2 sticks butter, softened
6 pounds powdered sugar
1 tablespoon vanilla
2-4 tablespoons milk
fresh ground sea salt

directions:
FOR THE CUPCAKES:
In a stand mixer, beat together the butter, brown sugar and eggs until light and fluffy. Add the sour cream and milk and beat until combined. Add the remaining ingredients, then beat together just until all ingredients are moistened. Be careful to not overbeat the batter.

Spoon into a muffin tin lined with 24 cupcake wrappers. Bake in an oven preheated to 350 degrees for 17-19 minutes, or JUST until the cupcakes spring back to the touch. Remove and cool completely, then use a small ice cream scoop to remove the center portion of each cupcake. Fill with dark chocolate filling, then frost with white chocolate frosting. Sprinkle with sea salt and chocolate sprinkles to finish.

FOR THE FILLING:
In a medium, microwave-safe bowl, heat together the chocolate chips, cream, and vanilla. Whisk together until smooth. Spoon into the center of cooled cupcakes.

FOR THE FROSTING:
In a small microwave-safe bowl, melt the white chocolate chips just until smooth (zap for about 60 seconds, then stir until smooth. If the chips aren't melted entirely, return to the microwave for an additional 20 seconds, then stir again. This will ensure the chocolate melts, but doesn't burn).

Use a spatula to spoon the melted chips into an electric stand mixer. Add the butter and beat together until smooth and creamy. Slowly add powdered sugar and vanilla to the mix, then add just enough milk to make the frosting soft, but not runny. Frost cupcakes, sprinkle with sea salt and chocolate sprinkles for decoration and amazing flavor! Enjoy!