These are to die for bachelorette party cupcakes that everyone will love. You can also make them into mini cupcakes for bite sized treats.
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Preheat oven to 350F.
Line a muffin tin with cupcake liners.
In a small pot on low heat melt butter and chocolate, stirring to keep it smooth and prevent burning. Add in cocoa powder and mix in till smooth. Set aside to cool.
Whisk together flour, baking soda, baking powder, salt, and sugar. Add in eggs, vanilla, and sour cream. Mix till well incorporated. Mix in melted chocolate.
Scoop batter into prepared muffin tin and fill 3/4. Bake for 20 to 25 minutes, or until an inserted toothpick comes out clean. Set to cool, once cool enough to touch turn out of pan and let cool fully on a wire rack.
In a large mixing bowl, whip the butter on medium-high speed for 5 minutes, stopping to scrape the bowl once or twice.
Reduce the speed to low and gradually add the powdered sugar. Once all of the powdered sugar is incorporated, increase the speed to medium-high and add the vanilla and food colouring, mixing until incorporated and desired color is reached. Whip at medium-high speed until light and fluffy, about 2 minutes, scraping the bowl as needed.
Pipe icing onto each cupcake and sprinkles and party decorations.