Grease and line two 8-inch (20 cm) round cake pans with parchment paper (baking paper)
Preheat the Oven: Position the oven rack in the middle of the oven, and preheat to 356° F / 180° C (160° C fan)
Cream the Butter and Sugar: In a large mixing bowl, beat the butter and sugar together until light in texture and pale in color (about 3-4 minutes)
Add the Eggs: Add the eggs one at a time, mixing well after each addition. Scrape down the sides of the bowl with a spatula to ensure everything is combined. (see note 1)
Sift Dry Ingredients: Sift the all-purpose flour, baking powder, and salt over the butter mixture.
Combine the mixture: Gently fold the sifted dry ingredients into the butter mixture until just combined, ensuring there are no visible streaks of flour in the batter. (See note 2)
Divide the Batter: Evenly divide the batter between the prepared pans and spread it smoothly with a spatula. (See note 3)
Bake for 20-25 minutes, or until a toothpick inserted into the center comes out clean. (See note 4)
Cool the Cakes: Allow the cakes to cool in the pans for about 10 minutes before carefully turning them out onto a wire rack to cool completely.
Filling: Once the cakes have cooled, spread a generous layer of jam over one cake layer. You can add whipped cream as well if you like. Place the second cake layer on top and press down gently.
Dust with powdered or superfine sugar (caster sugar) before serving.