Calico Potatoes

• 2 tablespoons olive oil
• 1⁄4 cup onion, diced
• 1 lb russet potato, thinly sliced
• 3⁄4 lb sweet potato, peeled and thinly sliced
• 2 tablespoons water
• 1 teaspoon seasoning salt 
• 1lb smoked sausage, cut into 1-inch slices

1. Add the olive oil to a large skillet. Preheat over medium heat until the oil is just hot. Add the diced onion. Cook the onion until they're tender.
2. Add the unpeeled, sliced russet potatoes, the sliced sweet potatoes and water to the vegetables in the skillet. If adding sausage, stir it in now. Sprinkle the mixture with the seasoning or seasoned salt.
3. Cover and cook over medium heat for 12 to 15 minutes or until potatoes are tender, turning potatoes once or twice.