Asparagus Casserole

Ingredients (16)

• 1/2 cup whole wheat panko breadcrumbs
• 1/4 cup freshly grated Parmesan cheese
• Zest of 1 small lemon
• 3 tablespoons unsalted butter
• 1 tablespoon extra-virgin olive oil
• 2 pounds asparagus
• 1 medium onion very thinly sliced
• 8 ounces baby bella (cremini) mushrooms, sliced
• 3 tablespoons all-purpose flour
• 2 cups 2% milk
• 1 teaspoon kosher salt
• 1/2 teaspoon black pepper
• 1/2 teaspoon dried basil
• ⅛ teaspoon ground nutmeg
• 7 ounces 2% Greek yogurt
• 1/4 cup chopped fresh basil