Pastelitos Tres Leches

Name: Pastelitos Tres Leches (Three-Milk Cupcakes)
Yield: Makes 12 Cupcakes
Cuisine: Mexican
Ingredients: ½ teaspoon salt; ½ teaspoon baking soda; 1 cup [200 g] sugar; ½ cup [110 g] butter (1 stick), room temperature; ¾ teaspoon baking powder; 1 cup [140 g] all-purpose flour; 1 cup [240 ml] buttermilk; ¼ cup [60 ml] neutral oil; 2 eggs, room temperature; 1 tablespoon vanilla extract; ¼ cup [60 ml] heavy cream; 1 cup [240 ml] heavy cream; ½ cup [120 ml] evaporated milk; ½ cup [120 ml] sweetened condensed milk