I am looking for a great white frosting that does not use 4 sticks of butter or cream cheese. What's your favorite?

A good recipe for seven minute frosting by kitchenaid. You can find it online. It remains on the softer side like not fully prepared marshmallows.

If not too late or for another time...1.5c confectioners sugar, tsp lemon zest, 3tbsp lemon juice, 1 tbsp olive oil (recipe credit: Bertolli olive oil co). Gear on quick breads and chocolate cake.

nothing wrong with whipping cream in my house. It's white ! and yummy.

Do you not want ANY cream cheese or just not a straight cream cheese? I wanted a lighter version for my banana cake - it is cream cheese meets whipped cream - maybe that would work for you?

https://food52.com/recipes/26904-banana-cake

This is my favorite icing! This recipe has been in my family for yrs. Light in consistency, not to sweet, can be made in vanilla or chocolate (add cocoa powder). To a small pot add 1 cup milk (I use 2%) and 5 TBLS flour. Cook over very low heat on the top of stove, stir constantly until the milk & flour thicken to a paste. When the mixture starts to boil, remove from the stove and completely cool. I transfer mixture to a small bowl and put a piece of wax paper over the bowl so not to get a hard coating on top of the mixture. When mixture is completely cool (cannot be warm, must be cool) cream 1 cup plus 2 TBLS butter and 1 cup of sugar in mixer until very light and fluffy. Add 1 teaspoon vanilla. On very low speed of mixer, add the milk & flour paste in 4 to 5 additions, beating thoroughly after each addition. This will frost a pound cake or a 8" double layer cake. This recipe can be doubled if making a larger cake.

My favorite white frosting is a boiled milk or ermine frosting. There is butter but only 1 stick.

Good old seven minute frosting or Italian Meringue work great, zero fat and super look, can add a few drops of lemon or almond or vanilla extract