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Make the Cake: Preheat the oven to 350°F (175°C). Grease and flour two 9-inch cake pans. Mix dry ingredients, then add eggs, milk, oil, and vanilla. Stir in boiling water until smooth. Bake for 30-35 minutes, then cool completely.
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Make the Frosting: Beat butter until creamy. Gradually add powdered sugar, champagne, vanilla, and salt. Beat until fluffy, adding heavy cream to adjust consistency.
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Assemble the Cake: Layer one cake, top with frosting, then place the second layer. Frost the entire cake, adding a crumb coat first and refrigerating for 20 minutes.
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Decorate: Dust with edible gold dust or glitter. Add fondant toppers and optional garnishes like fresh berries or edible flowers.