Ingredients:
For the vanilla butter cake:
1 1/2 cups all-purpose flour
1 1/2 tsp baking powder
1/4 tsp salt
1/2 cup unsalted butter, softened
1 cup granulated sugar
3 large eggs
1 tsp vanilla extract
1/2 cup whole milk
For the buttermilk sauce:
1/2 cup unsalted butter
1 cup granulated sugar
1/2 cup buttermilk
1 tsp vanilla extract
1/2 tsp baking soda
Instructions:
1. Make the Cake:

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