In a large mixing bowl add the softened butter and the sugar and mix on medium speed until light and fluffy, then beat in the eggs one at a time.
Measure the flour, salt, and baking powder together, then stir to combine. Mix the vanilla and milk together in a measuring cup.
Beat in the half the flour then all the milk on medium speed, then the rest of the flour. Mix just until the flour is mixed in.
Pour the batter over the fruit and smooth with a spatula.
Bake for 40-45 minutes, or until golden brown and bubbly.
Remove cake from oven and let sit for 10 minutes.
With oven mitts, place a serving plate over the skillet and gently flip the cake upside down onto the plate. The cake will still be hot so be careful. Leave the skillet or pan upside down on the plate for a minute until the cake and topping have been released.
Serve this cake warm or at room temperature. Store leftovers in the refrigerator for three days.