Yes, you can absolutely make sugar-free peach cobbler in a baking dish instead of individual ramekins. Simply use an appropriately sized baking dish (like an 8x8-inch or 9x9-inch dish) and follow the same recipe instructions, adjusting the quantities as needed to fill the larger dish. The overall baking time may vary slightly, so keep an eye on it and bake until the cobbler topping is golden brown and the peaches are bubbling.