Preheat the oven to 350°F (175°C). Grease and flour a loaf pan.

In a mixing bowl, cream together the softened butter and sugar until light and fluffy.

Add the eggs one at a time, beating well after each addition.

Mix in the vanilla extract.

In another bowl, combine the flour and baking powder.

Gradually add the dry ingredients to the wet mixture, alternating with the milk.

Fold in the mashed strawberries.

Pour the batter into the prepared loaf pan.

Bake for 60 minutes or until a toothpick inserted into the center comes out clean.

Let the cake cool in the pan for 10 minutes before transferring to a wire rack to cool completely.