New York Mashed Potato Knish - Potatoes USA - Philippines

Ingredients

• 2 1/2 cups Boiling Water
• 1 tbsp Unsalted Butter
• 3 cups Dehydrated Potato Flakes
• 1/2 cup Fresh Milk
• 1 cup Mashed Potatoes
• 2 1/2 cups All - Purpose Flour
• 1 tsp Baking Powder
• 1/2 cup Water
• 2 pcs White Onion, minced
• 3 tbsp Grated Parmesan Cheese
• Salt and Pepper, to taste
• 1 pc Egg, beaten for brushing dough