Preheat oven to 350°F. For the croutons, heat a medium-size skillet over medium heat with oil. Melt butter into oil then add garlic and swirl for a minute or two; toss bread cubes in garlic butter. Arrange croutons on a baking sheet and season with black pepper and 1/2 cup Pecorino. Bake croutons to deeply golden brown, remove and reserve.
Raise oven temp to 375°F.