Oyster Swiss Chard Gratin with Country Bacon

Name: Oyster Swiss Chard Gratin with Country Bacon
Ingredients: 3 thick slices smoky bacon, cut into small dice; 2 tablespoons unsalted butter; 1 small onion, minced; 2 cloves garlic, minced; 2 bunches Swiss chard, stemmed, leaves chopped into 1/2-inch dice; 2 cups heavy cream; 1/8 teaspoon freshly grated nutmeg; 18 oysters, freshly shucked, patted dry, and coarsely chopped; 1/2 teaspoon salt; 1/2 teaspoon freshly ground black pepper; 1 cup freshly grated Parmesan cheese; 1 cup fresh bread crumbs