*The caramel is a little tricky just in that it needs to be the right temperature-- warm enough that it's still liquid and can blend into the buttercream, but not so hot that it melts the butter making everything too thin. Evaluate the buttercream at about 4 tbsp of caramel-- if it's getting way too thin, stop adding caramel or add more powdered sugar. I found that 6 Tbsp. was perfect for my batch.