Green Bean Casserole With Crispy Shallots

Name: Green Bean Casserole With Crispy Shallots
Ingredients: 1/4 cup olive oil; 6 medium shallots, sliced into rings (about 1 cup); 1 1/2 pounds thin fresh string beans or haricots verts, trimmed; 1 pound button mushrooms, sliced; 6 large cloves garlic, minced; 1 tablespoon chopped fresh thyme; 3 cups low-fat (1 percent) milk; 3 tablespoons all-purpose flour; 1/3 cup plus 2 tablespoons freshly grated parmesan cheese; 1/2 cup finely chopped fresh parsley; 1/4 teaspoon ground nutmeg; Salt and freshly ground pepper; Olive oil cooking spray