Preheat the oven to 350 degrees.
In a stand mixer with the whisk attachment, add the cake mix, milk and melted better and begin mixing at a low speed.
As it mixes add in each eggs. Use a rubber scraper to scrape the bowl.
Once the ingredients are mixed. and batter begins fluffing, remove the bowl from the mixer and fold in the blueberries.
Place a cupcake liner into each cup of the muffin pans.
Use a 1/3 cup measuring cup to fill each liner.
Bake for 15-20 minutes, until the cupcakes spring back when poked.