Preheat the oven to 350 degrees F. Lay 6 12 x 18 in sheets of aluminum foil on the countertop and divide the potatoes, onions, garlic and herbs among the sheets. Season with salt and pepper. Cover each with another sheet of foil and fold into 6 tight packages. Transfer to 2 baking sheets and bake for about 45 minutes, until the potatoes are fork-tender. Take care when opening the foil packages; the escaping steam is hot. Remove the potatoes to a serving plate and serve immediately.