Wild Parsnip Colorado - 2 tablespoons olive oil, divided, 1 small onion, coarsely chopped (about 3/4 cup), 1 garlic clove, finely chopped, 1 thyme sprig, 1 medium parsnip (about 7 ounces), peeled, finely chopped, 12 ounces mixed wild mushrooms, such as maitake, shiitake, porcini, and/or crimini.