Combine oil, parsley, and garlic. Spread onto dough. Roll up, jellyroll-style and make 9-12 cuts along the roll, cutting about ¾ of the way down. Cut off 2 pieces from each side.
On a parchment-lined baking sheet, pull the middle piece into a crown-shaped circle. Top with the 4 pieces from the ends. Brush with egg and sprinkle with additional dried parsley and garlic salt.
Place baking sheet on the lowest rack of the oven and bake until golden, about 45 minutes.
Recipe by Between Carpools at https://betweencarpools.com/youre-making-this-garlic-challah-for-shabbos/