Preheat your oven to 350°F (175°C).
In a bowl, mix strawberries with granulated sugar and let sit for 10 minutes.
In a separate bowl, whisk together flour, baking powder, and salt.
In a large bowl, cream the butter until fluffy, then add sugar and mix well.
Beat in the eggs, one at a time, followed by vanilla extract.
Gradually mix in the flour mixture, alternating with milk until just combined.
Pour batter into a greased cake pan and spread evenly.
Bake for 25 minutes or until a toothpick comes out clean.
Cool the cake in the pan for 10 minutes, then transfer to a wire rack.
Once cooled, slice the cake in half horizontally and layer with strawberries and whipped cream.