Sweet Buttercream Frosting. This buttercream frosting is thick to start without adding in the cream. Use Cream Cheese Together with Butter.
Then you can add a little bit of cream a little. The only issue is cream cheese has a tendency to make a softer frosting. I always add 18 teaspoon.
You can control the consistency at this point add up to 12 cup more confectioners sugar if frosting is too thin or more heavy cream if frosting.
Less Sweet Buttercream Frosting. Or just go for the cream cheese flavor and make decorators cream cheese frosting. Here in the UK we just use 12 butter to icing sugar we dont add water veg fat churning and a touch of flavouring. Works well and a cake full of buttercream is my worst nightmare even my children arent keen.