Mashed Potatoes and Sweet Potatoes

Name: Mashed Potatoes and Sweet Potatoes
Prep time: 15 min
Cook time: 15 min
Total time: 30 min
Yield: 4 to 6
Ingredients: 3 cups (750 ml) potatoes peeled and cubed (about 5 medium potatoes); 3 cups (750 ml) sweet potatoes peeled and cubed (about 2 medium sweet potatoes); 2 tablespoons (30 ml) butter; 1/2 cup (125 ml) sour cream; Salt and pepper