Root Vegetable Au Gratin

Name: Root Vegetable Au Gratin
Ingredients: Nonstick cooking spray; 2 1/2 cups milk; 1 teaspoon fresh thyme leaves; 2 tablespoons butter; 1 tablespoon canola oil; 1 tablespoon minced garlic; 1/4 cup flour; 1 cup grated Cheddar; 1/4 teaspoon pumpkin pie spice; Salt and freshly ground black pepper; 5 large carrots, peeled, sliced on the bias 1/4-inch thick; 5 parsnips, peeled, sliced on the bias 1/4-inch thick; 1 cup breadcrumbs; 1/4 cup grated Parmesan; 2 tablespoons chopped fresh parsley