Not Your Mamma's Green Bean Casserole - The Local Palate

Ingredients

• 2 tablespoons butter
• 1 shallot, minced
• 2 small garlic cloves, minced
• 1 bay leaf
• 2 thyme sprigs
• 3 tablespoons flour
• 1¾ cups milk
• ¼ cup white wine
• Salt and pepper to taste
• Pinch of nutmeg
• ½ cup shredded white cheddar
• 2 pounds green beans, stemmed
• 3 tablespoons butter, divided
• 1 large onion, thinly sliced
• Salt to taste
• 1 tablespoon olive oil
• ½ pound oyster mushrooms, stemmed (shiitake or cremini also work well here)
• Pepper to taste
• 1½ cups white cheddar mornay sauce