Light and fluffy vanilla cupcakes with funfetti sprinkles baked inside.
Preheat oven to 180°C/350°F (160°C/325°F if using a fan or convection oven) and line a 12-hole cupcake tin with paper cases.
Mix together the soy milk and vinegar to make vegan buttermilk. Set it aside for 5 minutes to thicken slightly.
In a large bowl, mix together the flour, baking soda and caster sugar. Make sure there are no lumps left in the bowl.
Add in the buttermilk from earlier along with the oil and vanilla. Mix until smooth and make sure there's no dry mixture left at the bottom of the bowl.
Gently fold the sprinkles into the cake batter.
Divide the mixture between your cupcake cases and bake for 18-20 minutes, until a toothpick through the centre comes out clean.
Transfer the cupcakes to a wire rack and leave them to cool completely.
Add the vegan butter and vanilla into a large bowl. Beat with an electric whisk or wooden spoon until pale and fluffy.
Slowly add the icing sugar, a little at a time and keep mixing it together until combined.*
Pipe some buttercream frosting onto each cupcake and decorate with a few more sprinkles.