Preheat oven to 375°
Prepare muffin tin by spraying with a nonstick spray or lining with paper liners
In a large mixing bowl, mix together butter, and sugar with an electric mixer.
Mix in eggs. Mix until light and fluffy.
Add milk, lemon zest, lemon juice and vanilla. Mix
Add flour and baking powder. Mix just until most of the flour is mixed in.
Add raspberries and gently fold in.
Put into muffins tins, either spray or lined with paper liners.
Bake at 375° for 18-20 minutes.
Let cool in muffin tins for 5-10 minutes then gently remove from muffin tin and continue cooling on a baking rack
Best eaten when fully cooled.