Fill a small saucepan with about 2 inches of water and bring it to a simmer. Place a heat-safe bowl on top without it touching the water, and put your chocolate in. Stir it well until it’s about 90% melted, then remove it from the heat and stir until fully melted. Make sure water doesn’t get into the chocolate, or else the chocolate will seize. Then add the butter and follow the recipe.