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Preheat the oven to 350 and grease a 9×13 baking dish or two 9” cake pans.
In a stand mixer bowl or large bowl, combine the dry ingredients.
Add the softened butter to the flour mixture and combine.
In a separate bowl, mix together sourdough starter, milk, eggs, melted coconut oil and vanilla.
Slowly add the wet ingredients to the butter flour mixture. Start the mixer on low and work up to medium speed.
Mix until smooth without lumps.
Bake for 30-35 minutes until it starts to turn golden around the edges and a cake tester comes out clean. 35-45 minutes for 9" cake pans
Allow to cool completely before frosting.
To a stand mixer with a whisk attachment (or a bowl and hand mixer), add softened butter and beat until smooth.
Add powdered sugar and start the mixer on low and work up to medium speed. Whisk until nice and fluffy. Scrape the sides of the bowl as needed.
Add whipping cream, salt, and vanilla and whisk for 1-2 more minutes.
Spread onto completely cooled cake.