Position a rack in the center of the oven and heat the oven to 350°F. Spread the bread cubes and pancetta on a rimmed baking sheet. Sprinkle with the oil and a few grinds of black pepper and toss to combine. Bake, stirring a few times, until the pancetta is crisp and the bread cubes are golden, about 20 minutes. Let cool.
Make Ahead Tips
The croutons can be made up to 2 hours ahead and kept at room temperature. If you have leftovers, refrigerate them.
Photo: Scott Phillips