Heat a large nonstick griddle or 2 nonstick skillets and brush lightly with butter. Form 2-tablespoon-size balls of dough and place half of them on the griddle. Using a lightly oiled spatula, press the dough into 3-inch rounds. Cook over moderately low heat, turning once, until golden on both sides and cooked through, about 7 minutes. Transfer the cakes to a baking sheet and keep warm in the oven. Repeat with the remaining dough, brushing the griddle with butter if necessary.