First, buy a round loaf of bread. Cut the bread horizontally and vertically, but don't cut all the way through the bottom. You want to be able to pull the pieces out. (Kind of like a blooming onion at Outback)
Take about 1/2 cup of pesto (which you can find in the spaghetti sauce aisle) and stuff all the cracks with it.
After you have stuffed the cracks with pesto, go back and fill all the cracks with mozzarella cheese.
Mix some melted butter and garlic salt together, and brush over the top of the bread. Cook at 350 for 15-20 minutes. mmmm...so delicious!