Preheat your oven to 350°F (175°C).
In a small bowl, mix the melted butter and brown sugar. Spread this mixture evenly in a 9-inch round cake pan.
Arrange the strawberry halves over the butter and sugar mixture, cut side down.
In a large bowl, whisk together the flour, baking powder, and salt.
In another bowl, cream together the softened butter and granulated sugar until light and fluffy. Add the eggs one at a time, beating well after each addition. Stir in the vanilla.
Add the flour mixture to the butter mixture alternately with the milk, beginning and ending with the flour mixture. Mix until just combined.
Pour the cake batter over the strawberries in the pan, spreading evenly.
Bake in the preheated oven for 40 minutes, or until a toothpick inserted into the center of the cake comes out clean.
Allow the cake to cool in the pan for 5-10 minutes, then run a knife around the edge of the pan and invert the cake onto a serving plate.
Serve warm or at room temperature.