Keep in mind that goat cheese is heat sensitive and will become a little bit grainy and start to separate when heated at a high temperature. It doesn't affect the taste at all but if you prefer to maintain a nice smooth look to the dip, heat at a lower temperature just until the cheeses are melted. If you like the nice browned topping when it’s baked at a higher temperature, don't worry about it being a little bit grainy. It still tastes amazing!