Preheat oven to 350°F (175°C). Grease and flour a 9-inch round cake pan.

In a large bowl, whisk together the flour, sugar, baking powder, baking soda, and salt.

In a separate bowl, whisk together the buttermilk, melted butter, and vanilla extract.

Add the wet ingredients to the dry ingredients and mix until just combined.

Gently fold in the chopped strawberries.

Pour the batter into the prepared cake pan and bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean.

Let the cake cool in the pan for 10 minutes before inverting it onto a wire rack to cool completely.

In a large bowl, beat the butter until light and fluffy.

Gradually add the powdered sugar, alternating with the milk, and beat until smooth and creamy.

Stir in the vanilla extract.

Frost the cooled cake.