Healthier Green Bean Casserole - Food Gardening Network

Ingredients

• 2 pounds fresh green beans, trimmed and cut into bite-size pieces
• 2 tablespoons unsalted butter or olive oil
• 16 ounces white button mushrooms, thinly sliced
• 4 cloves garlic, minced
• 3 tablespoons all-purpose flour (or cornstarch, if gluten-free)
• 1/2 cup chicken or vegetable stock
• 1/2 cup grated Parmesan cheese (not packed)
• 1/2 teaspoon kosher salt
• 1/4 teaspoon freshly ground black pepper
• 1 tablespoon unsalted butter or olive oil
• 1 red onion, thinly sliced
• 1 cup panko bread crumbs (or gluten-free panko bread crumbs, if gluten-free)
• 1/4 cup freshly grated Parmesan cheese
• 1/4 teaspoon kosher salt