Easy oven roasted root vegetables

Name: Easy oven roasted root vegetables
Ingredients: 1 lb yams (orange sweet potatoes) - 2 small or one large, peeled; 3/4 lb red potatoes scrubbed clean, peel on; 1/2 lb beets (red or golden), trimmed and scrubbed clean; 1/2 lb large carrots peeled and halved lengthwise; 1 parsnip medium-sized (4-5 oz), peeled and halved lengthwise; 1/2 red onion peeled; 6 whole garlic cloves large sized; 1/4 cup extra virgin olive oil divided; 2 tbsp fresh thyme leaves (or 2 tsp dried thyme); 5 sprigs fresh rosemary (or 3 tsp dried rosemary); 1 tsp ground cumin; 1 tsp kosher salt or more to taste; 1/4 tsp black pepper or more to taste