Lazy Shepherd's Pie | Canadian Living

Ingredients

• 4 large potatoes (unpeeled), 2 lb (900 g), cubed
• 1/4 cup milk
• 1/4 cup buttermilk
• 1 green onion sliced
• 1 lb lean ground beef
• 1 tablespoon vegetable oil
• 2 1/2 cups small mushrooms
• 1 onion diced
• 1 teaspoon dried thyme
• 1/4 teaspoon salt
• 1/4 teaspoon pepper
• 1 1/2 cup sodium-reduced beef broth
• 1 tablespoon cornstarch
• 1 tablespoon Dijon mustard
• 1 cup frozen peas