Cut a thin slice off the top of the boule. With a paring knife, cut out the center of the bread to make a cavity to hold the dip. Make sure the bottom of the loaf remains about 1-inch thick. Cut removed bread into cubes to be served with the dip.
Combine the sour cream and cream cheese in a medium size bowl. Mix until smooth. Add remaining ingredients and mix well.
Spoon dip into the boule. Bake for 25-30 minutes until the dip is hot and bubbly. Serve warm with bread cubes, crackers, tortilla chips or carrots.