3 mushroom leek and fontina frittata Recipes

olive oil, divided, leeks, whites and pale-green parts only, chopped, crimini (baby bella) mushrooms, thinly sliced, eggs, creme fraiche or sour cream, coarsely chopped flat-leaf parsley, shredded fontina cheese, divided, kosher salt , freshly ground pepper

butter, chopped leeks (white and pale green parts only), asparagus, trimmed , cut on diagonal into 1-inch pieces (about 2 1/2 cups), sliced stemmed shiitake mushrooms, omega-3 eggs, diced fontina cheese, divided, salt, ground black pepper, grated parmesan cheese