Preheat your oven to 350°F (175°C) and grease two 8-inch round cake pans.
In a large bowl, combine the flour, sugar, and baking powder.
Add the plant-based milk, vegetable oil, and vanilla extract. Mix until a smooth batter forms without overmixing.
Divide the batter evenly between the prepared cake pans.
Bake for 25–30 minutes, or until a toothpick inserted into the center comes out clean.
Allow the cakes to cool in the pans for 10 minutes, then transfer them to a wire rack to cool completely.
Spread a generous layer of vegan buttercream over one cake layer, followed by an even layer of strawberry or raspberry jam.
Place the second sponge layer on top and gently press down.
Dust the top with powdered sugar before serving. Slice and enjoy.