Chubby Hubby - A love for quiche: asparagus quiche with mashed potato crust

Ingredients

• 1 small sweet potato, about 250g
• 1 large potato, about 250g (use 500g potatoes if sweet potatoes are not available)
• ½ cup finely minced onion
• Butter, about 30g
• Salt and pepper
• 75g of mild cheddar cheese
• 75g of mature cheddar cheese or 150g of any cheese
• 8 to ten asparagus stalks, depending on thickness
• tarragon
• thyme
• 3 eggs
• one cup (250ml) milk
• paprika