To prepare a buttermilk strawberry shortcake recipe, first you'll need to prepare the ingredients. First, you will need the following ingredients: 1 cup (240 ml) butter, 2 tablespoons (25 g) sugar, 1 teaspoon vanilla, and 2 teaspoons of salt. You will also need 1 tablespoon of flour and 1/4 teaspoon of baking powder. Mix the dry ingredients with the wet ingredients until they're just combined. Then, pour the batter into the prepared pan and bake it for 20 to 25 minutes, or until the top is golden brown. Remove the pan from the oven and allow the cake to cool for 5 minutes before cutting it into squares.