Ingredients
- For the Fried Onions
- 3 tablespoons cornstarch
- 3 tablespoons white rice flour
- 1 medium onion, sliced into thin strips
- For the Casserole
- Vegetable oil for frying
- Salt, to taste (optional)
- 3 tablespoons olive oil, divided
- 1 small onion, finely diced
- 8 ounces white button mushrooms, finely chopped (approximately 3 cups)
- 1 clove garlic, minced or put through a garlic press
- 2 cups milk, divided
- 2 tablespoons cornstarch
- 1 (16-ounce) bag frozen French-cut green beans, thawed and drained or 16-ounces fresh green beans, cleaned, trimmed, and cooked until tender
- 1/8 teaspoon ground thyme
- Salt and pepper, to taste
- 1/4 cup grated Parmesan cheese, divided
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