Healthy Green Bean Casserole

Ingredients (for 8 servings)

• 1½ lb — green beans
• 2 tbsp — olive oil
• 8 oz — cremini mushrooms
• 2 whole — garlic cloves
• 3 tbsp — whole wheat flour
• 1 cup — vegetable broth
• 1 cup — milk
• ¾ tsp — sea salt
• ¼ tsp — black pepper
• 1 large — yellow onion
• ½ cup — panko breadcrumbs
• ¼ cup — parmesan cheese