Quiche with Swiss Chard and Mushroom

Name: Quiche with Swiss Chard and Mushroom
Ingredients: 3 large pastured organic eggs; 1 heavy cream; 4 ounces white or crimini mushrooms, chopped; 1/4 cup finely chopped red onion or shallot; 2 tablespoons unsalted butter; 5 ounces Swiss chard leaves (no stems), chopped; salt (to taste); freshly ground black pepper (to taste); 5 ounces Prima Donna aged Gouda cheese, shredded; 1 tablespoon cold butter, cut into small pieces; Dash nutmeg; 1 prepared pie crust or quiche pastry dough