Leek and Asparagus Frittata

Ingredients

2 tablespoons (1/4 stick) butter
1 cup chopped leeks (white and pale green parts only)
1 12-ounce bunch thin asparagus, trimmed, cut on diagonal into 1-inch pieces (about 2 1/2 cups)
1 cup sliced stemmed shiitake mushrooms
8 large omega-3 eggs
1 cup diced Fontina cheese, divided
1/2 teaspoon salt
1/2 teaspoon ground black pepper
1/4 cup grated Parmesan cheese

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