Preheat your oven to 350°F (175°C). Grease and flour a cake pan.
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.
In another bowl, whisk together the flour and baking powder. Gradually add to the butter mixture, alternating with the milk. Stir in the vanilla extract.
Fold in the sliced strawberries. Pour the batter into the prepared 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 turn out onto a wire rack to cool completely.