One Pot Savory Sausage Shepherd's Pie

Ingredients

• 1 lb (454 g) sweet Italian sausage – meat only (no casing)
• ½ lb (225 g) lean ground beef
• 1 yellow onion, diced
• Salt, pepper
• 2 carrots, sliced
• 1 celery stalk, diced
• ¼ cup (60 ml) flour
• ½ cup (125 ml) tomato sauce
• 2 cups (500 ml) chicken broth
• 1 sprig thyme
• 1 cup (250 ml) frozen peas
• 3 cups (750 ml) mashed potatoes