JoAnna's Baked Potato Soup

My friend had this recipe on her blog and I thought it looked yummy!

BAKED POTATO SOUP-
3 tbsp butter-
1 cup finely chopped onion-
2 tbsp flour-
1 (14 1/2-ounce) can of Chicken broth-
4 medium baking potatoes, peeled and cut into 1/2" cubes-
1/2 tsp salt-
1/4 tsp white pepper-
1/4 tsp black pepper-
1 tsp dried basil-
dash tobasco sauce-
1/2 tsp garlic salt-
1 cup half & half

Melt butter in a 2-quart saucepan on medium heat. Add onion and saute for 2 minutes. Sprinkle flour over the onions and cook about 5 minutes, stirring often. Gradually add chicken broth. Add potatoes, salt, white, peppers, basil, tabasco, and garlic salt. Bring to a boil, reduce heat to low and simmer 20 minutes. Stir occasionally. Stir in half & half and heat through. Serves 4, but doubles easily. Garnish with grated cheese, sour cream, crumbled bacon, chopped green onions.