Preheat the oven to 350°F. Line a 9 x 13-inch baking pan with parchment paper.
To make the batter: In the bowl of a stand mixer with the paddle attachment, (or alternatively, in a large bowl with a wooden spoon) add the canola oil, buttermilk, eggs, cane sugar, cake flour, vanilla bean, baking powder, and sea salt in that order. Mix on low until combined into a smooth batter.
Transfer to the prepared baking pan and bake for 30 to 35 minutes or until a toothpick inserted in the center comes out clean. Allow to cool completely in the pan.
To make the icing: In the bowl of a stand mixer fitted with the paddle attachment (or using a hand mixer) add the butter, powdered sugar, vanilla extract, and heavy whipping cream. Mix on low until combined, then speed up to high and mix for 1 minute or until light and fluffy.
Top the cake with the frosting and top with white sprinkles.
Store in an airtight container in the fridge for up to 3 days.