Preheat your oven to 350°F (175°C) and grease two 8-inch round cake pans. Line the bottoms with parchment paper for easy removal.
In a large mixing bowl, cream together the softened vegan butter and granulated sugar until light and fluffy. This should take about 3-4 minutes using an electric mixer.
In a separate bowl, combine the almond milk and apple cider vinegar. Allow it to sit for 5 minutes to create a vegan buttermilk.
Add the vegetable oil and vanilla extract to the vegan buttermilk and whisk until well combined.
Gradually incorporate the wet ingredients into the creamed butter and sugar mixture, mixing until fully combined.
In another bowl, sift together the self-rising flour, baking powder, and salt. Gradually fold this dry mixture into the wet ingredients, being careful not to overmix.
Once the batter is smooth, evenly divide it between the two prepared cake pans. Smooth the tops with a spatula.
Bake in the preheated oven for 25-30 minutes, or until a toothpick inserted in the center comes out clean.
Allow the cakes to cool in the pans for about 10 minutes before transferring them to wire racks to cool completely.
Once the cakes are completely cool, spread a layer of jam on top of one cake layer, then add the vegan whipped cream or buttercream.
Place the second cake layer on top and dust with powdered sugar or frost as desired.
Slice, serve, and enjoy your Vegan Victoria Sponge!