Roasted Vegetable Meatloaf with Balsamic Glaze

Name: Roasted Vegetable Meatloaf with Balsamic Glaze
Ingredients: 3 tablespoons olive oil; 1 large zucchini, finely diced; 1 red bell pepper, finely diced; 1 yellow pepper, finely diced; 5 cloves garlic, smashed to a paste with coarse salt; 1/2 teaspoon red pepper flakes, divided; Salt and freshly ground black pepper; 2 large eggs, lightly beaten; 1 tablespoon finely chopped fresh thyme leaves; 1/4 cup chopped fresh parsley leaves, plus more for garnish; 1/2 pound ground pork; 1/2 pound ground veal; 1 pound ground beef chuck; 1 cup panko (Japanese) bread crumbs; 1/2 cup freshly grated Romano or Parmesan; 1 cup ketchup, divided; 1/4 cup plus 2 tablespoons balsamic vinegar