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["Directions", "", "Preheat oven to 375 degrees F. Lightly dust a baking sheet with flour and set aside.", "", "Combine 2 beaten eggs, 1/2 tsp salt, baking powder, vegetable oil and flour in a mixing bowl. Stir together until a soft dough forms. Turn out onto a floured surface and knead 8-10 times, until dough becomes slightly elastic. Cover dough and allow to rest for 15-20 minutes.", "", "While dough rests, bring a pot of salted water to a boil. Add diced potatoes and cook until very soft, 12-15 minutes. While potatoes cook, heat butter in a medium frying pan over medium-high heat. Add onions and thyme and cook for 5-6 minutes until onions are lightly browned and very fragrant. Remove from heat and scrape into a mixing bowl. Once potatoes have cooked, drain them and add them to the bowl with the onions and thyme. Add cheese and mash with a fork or potato masher until potatoes have very few lumps. Add remaining 1/2 tsp salt and fresh ground pepper to taste and set aside.", "", "Once dough has finished resting turn it out onto a floured surface. Knead a few times and form dough into a cylinder, about 8"" long. Cut dough into 8 equal pieces. Use a rolling pin to roll each piece into a 4-5"" circle. Scoop 3-4 tbsp of the potato mixture into the center of each circle and pinch the ends together, so it looks like a little bundle.", "", "Beat remaining egg together with 1 tbsp water. Use a pastry brush to lightly brush the tops of the knishes with the egg wash.", "", "Bake for 15-18 minutes, or until knishes are golden brown.", "", "Serve hot, with sour cream if desired."]