Frittata with Sausage, Wild Mushrooms and Cheddar

INGREDIENTS

• 8 eggs
• Kosher salt and freshly ground pepper, to taste
• 6 oz. white cheddar cheese, cut into 1/4-inch dice
• 1 tsp. plus 2 Tbs. olive oil
• 1/2 lb. mild Italian sausage, casings removed
• 3/4 lb. assorted wild mushrooms, cleaned, trimmed and cut into 1- to 2-inch pieces
• 1 bunch Swiss chard, about 3/4 lb., stems removed and leaves cut into 1-inch strips