Heat oven to 350°. Mix eggs, melted butter, milk, and vanilla in a mixing bowl. In a separate bowl mix oatmeal, baking powder, salt, allspice, and sugar. Combined ingredients and stir until blended. Pour final mixture into 9x13 baking dish. Bake for up to 45 minutes. Serve warm with additional milk and extra toppings (fruit slices, nuts, brown sugar, etc).