Sweet Potato and Corn Chowder

Name: Sweet Potato and Corn Chowder
Ingredients: 2 tablespoons unsalted butter; 4 slices thick-cut bacon, cut into a small dice; 2 cups diced peeled sweet potato; 2 medium shallots, sliced; 2 cloves garlic, chopped; 1 small red bell pepper, diced; 3 sprigs fresh thyme; 1 sprig fresh sage; 1 bay leaf; Kosher salt and freshly ground black pepper; 1/4 cup all-purpose flour; 2 teaspoons yellow curry powder; One 15-ounce can corn, drained; 2 cups chicken stock; 1 cup heavy cream; 1 tablespoon sherry vinegar; 1/4 cup minced chives