The yellow one is Yukon Gold, the brown one is Russett. Russett is perfect for Mashed Potatoes, it’s fluffy and light. I used them for my side dish to pairs with steaks and seafoods. I throw some fresh garlic in with potatoes too. Next time try adding warm milk and good butter instead of Parmesan cheese, it’s test great too without too many ingredients. I like simple and easy cooking for my family. Just some new idea to share!.