https://www.seriouseats.com/2020/01/frostings-guide.html
buttercream is versatile and fast, ready in minutes or less. what flavors work best: thanks to its sweet and simple meringue base, swiss buttercream goes with just about everything. what to avoid: high-moisture ingredients, such as cream cheese, sour cream, mascarpone, fresh fruit purée or juice, beer, wine...