Vegan Misir Wot Pierogi

Ingredients:

• 12 ounces russet potatoes (1 large or 2 small)
• 1 1/2 cups red lentils, rinsed
• 3 tablespoons berbere spice mix (see Cook's Note)
• 2 tablespoons tomato paste
• 1 tablespoon onion powder
• 2 teaspoons garlic powder
• Salt
• Vegetable oil, as needed
• Instant potato flakes, as needed
• All-purpose flour, for dusting
• Vegan Pierogi Dough, recipe follows
• Caramelized onions and sour cream, for serving
• 3 1/2 tablespoons whole flax seeds
• 3 tablespoons plus 1 teaspoon instant mashed potatoes
• 6 cups all-purpose flour
• 6 tablespoons warm water
• 1 teaspoon baking powder
• 1 teaspoon salt

Source