medium saucepan (about 2-quart size); 2-quart casserole
Store raspberries and blueberries in their original container or spread them out in a dish or pan lined with paper towels. Raspberries specially are very fragile, so plan to use them within a day or so to avoid moldy berries.
For a splashing finish, pass a pitcher of whipping (heavy) cream, half-and-half or eggnog, when it is available, to pour over bowls of warm cobbler. Sprinkle a little ground cinnamon or nutmeg on top for just a hint of spiciness.
Drop dough by 6 spoonfuls onto hot berry mixture.