Roasted Garlic Potato Soup without oregano

6 cups chicken stock 2 cups small potatoes , cleaned or 2 cups potatoes , peeled & cut into 1/2 inch dice 1 cup onion , chopped 10 roasted garlic cloves,[...]

3 -5 whole garlic heads , unpeeled 3 1/2 tablespoons olive oil , divided 1 1/4 teaspoons salt , divided 1 teaspoon fresh ground black pepper , divided crushed[...]