A very basic buttercream frosting - no eggs, no heating required!
0.5 c (1 stick) unsalted butter, room temperature
3 cups powdered sugar, sifted
4 tbsp heavy cream
1 tsp vanilla
Cream butter in the bowl of a stand mixer with the whisk until light and fluffy.
Slowly beat in powdered sugar in small batches - it will fly everywhere!
Add cream and vanilla and beat on high until light and fluffy.
Optional: Replace the whisk with the paddle attachment and beat for a few seconds to get rid of air bubbles.