UPCAKES:

3/4 cup melted butter (salted)
3 whole eggs

1 1/3 cup fresh milk

1 teaspoon white vinegar

1 teaspoon vanilla extract

1 cup white sugar

2 cups all-purpose flour

1 teaspoon baking powder

1 teaspoon baking soda



BUTTERCREAM:

1 cup butter (salted)

1 cup all-purpose cream / thickened cream/ heavy cream

1 cup powdered sugar