Place the bread loaf on a cutting board. Using a serrated knife, make diagonal cuts across the top of the loaf, and then repeat in the opposite direction to create a diamond pattern of 1-inch pieces. Be careful not to cut all the way through the bread.
Cover the bread with foil and bake in the preheated oven for 15 minutes. For a crispy top, uncover the bread and bake for an additional 10 minutes. Before serving, garnish the bread with the remaining parsley and additional green onion. Serve warm.