Heat 3 Tbsp. extra-virgin olive oil in a medium skillet over medium until shimmering. Add torn bread and stir well to evenly coat in oil. Reduce heat to medium-low and cook, stirring occasionally, until golden brown and crisp in some areas, 4–5 minutes. You aren’t looking for croutons that are crisp all the way through—just some good browning on the outside. Season with kosher salt and freshly ground black pepper and transfer to a plate. Let cool; reserve skillet.