Sausage Tarts

Ingredients

• 24 frozen individual tart shells
• 300 g / 10 oz / 4 links mild Italian sausage, casing removed, chopped
• 30 ml / 2 tbsp olive oil
• 4 scallions, minced
• 125 g / 4 oz mushrooms, sliced thinly
• 5 ml / 1 tsp dried oregano
• 2 eggs
• 125 ml / 1/2 cup milk
• 125 ml / 1/2 cup / 60 g grated Parmesan
• To taste salt and freshly ground pepper
• As required small stuffed olives, sliced thinly