Preheat oven to 350°F and place paper liners in muffin tin.
In a medium mixing bowl, whisk together flour, baking powder, and salt. Set aside.
In a large mixing bowl, cream together butter and sugar.
Mix eggs and vanilla into butter mixture.
Stir in half of the dry ingredients, then all of the milk, then the rest of the dry ingredients until just combined.
Gently fold frozen blueberries into the batter.
Pour batter into prepared muffin tin.