To maintain a thick and creamy consistency in your frosting, ensure your ingredients are at cool room temperature, not overly soft or warm. Add powdered sugar gradually, about ½ cup (60 grams) at a time, while beating to control thickness. If it becomes too runny, adjust by gradually adding more powdered sugar, a few tablespoons at a time, until it thickens to your liking. For a firmer texture, briefly refrigerate the frosting for 15-30 minutes before frosting your dessert.