I can count on having potatoes and some sort of green chiles sitting around—mellow, earthy poblanos are especially handy. Then it’s easy to peel off the charred skin and cut the poblanos into rajas, or thin strips. Next you’ll boil some cubed Yukon potatoes until they’re tender enough to prick with a fork. About half of the price will come from about $4 worth of fresh poblano peppers, followed by two Yukon potatoes with a humble price tag of 75 cents. Use It UpAfter making the homemade crema, you’ll likely have some sour cream leftover.