Savoury tart with ham Recipe

• For the crust:
• 1 cup mashed potatoes
• 1/4 lb/ 110g butter
• 2 cups all purpose flour
• 1/2 tsp salt
• 2 tsp baking powder
• 1 egg yolk, mixed with 1 tbsp water
• The Filling:
• 1 cup prepared white sauce
• 1 cup grated cheddar cheese
• 1 cup shredded ham
• 2 hard boiled eggs, shelled & chopped roughly
• 3 tsp xhopped parsley
• 1 tbsp chopped onion
• 1 egg
• 1/2 cup of milk
• S&P to taste

Directions