Preheat the oven to 325°F. Butter a 2-cup broilerproof bowl or small baking dish or skillet. Puree in a food processor or mix in a bowl until smooth:
Fold in:
Transfer the mixture to the buttered dish. Sprinkle with:
Bake until heated through, about 25 minutes. If desired, turn the oven to broil to brown on top.