Slice the baguette diagonally into 1/4-inch-thick slices. Depending on the size of the baguette, you should get 20 to 25 slices.
Lay the slices in one layer on a baking sheet, brush each with olive oil, and sprinkle generously with salt and pepper. Bake the toasts for 15 to 20 minutes, until they are browned and crisp. As soon as they are cool enough to handle, rub one side of the toasts with the cut side of the garlic. Serve at room temperature.