Preheat oven to 350 degrees Fahrenheit and line the cupcake pan with liners.

In a large bowl, mix together butter and sugar. Then add eggs and vanilla extract and mix until it is well combined.

Take about a spoonful of flour (take it from the 3 cups of flour) and mix with the frozen blueberries, set aside.

Add the flour, baking powder and salt, to the wet ingredients. Then gradually add the milk and mix until well combined.

Add the batter into the cupcake pans and bake for 25-30 minutes. To check for doneness insert toothpick in the cupcakes and if toothpick is clean, cupcakes are ready!