Panera French Onion Soup

INGREDIENTS ▢4 tablespoons unsalted butter ▢4 cups sweet onions, sliced (about 2-3 large onions) ▢1 teaspoon salt, more to taste ▢1/2 teaspoon black pepper ▢1 teaspoon dried thyme ▢1 teaspoon granulated garlic Powder ▢4 tablespoons all-purpose flour ▢3/4 cup condensed tomato soup ▢4 cups chicken stock or beef stock ▢1 cup croutons…