Heat oven to 350 degrees. Whisk together parsley, thyme, lemon juice, garlic, salt, pepper, and olive oil in a small bowl.
Using a bread knife, slice loaf into 12 half-inch pieces, cutting only 3/4 of the way through the loaf so it stays intact. Brush herb mixture liberally between each slice. Wrap loaf loosely in foil. Heat until warm, about 10 minutes. Serve immediately.