For small batch baking, I always recommend using a scale to weigh ingredients! This is the only way to make sure the recipe comes out right every time.
If you aren't making homemade caramel, pick a good-quality store-bought caramel sauce instead!
If you're using a thinner caramel sauce, you might need to add a little more powdered sugar. Just add more powdered sugar, 1 Tablespoon (8 grams) at a time as needed.
This recipe makes about ¾-1 cup of frosting, which is enough for 6 cupcakes or a small sheet cake.