Preheat your oven to 350°F (175°C).
In a mixing bowl, cream together the 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, whisk together the flour and baking powder.
Gradually add the dry ingredients to the wet ingredients, alternating with the milk. Begin and end with the dry ingredients.
Fold in the sliced strawberries.
Pour the batter into a greased and floured cake pan.
Bake for 30 minutes or until a toothpick inserted into the center comes out clean.
Let the cake cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.