VEGETABLE TIAN Ingredients 2 tbsp olive oil (divided) 1 large sweet yellow onion cut in half and sliced 2 cloves of garlic, minced 1-2 russet potatoes, unpeeled 1 zucchini 1 yellow squash 3 large Roma tomatoes Sea salt, freshly cracked black pepper, to taste Dried thyme, to taste 1/2 cup of grated Parmesan cheese