Slice the baguette diagonally in 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 sheet pan, brush each with olive oil, and sprinkle generously with salt and pepper. Bake for 15 to 20 minutes, until browned and crisp. As soon as they're cool enough to handle, rub the top of the toasts with a cut side of the garlic. Serve at room temperature.