Cheddar Pierogies with Caramelized Onions and Bacon

Bahan-bahan (8 porsi)

• 2 cups all-purpose flour
• 1 teaspoon kosher salt
• 2 tablespoons salted butter, melted
• 1 cup plain full fat greek yogurt, plus more for serving
• 1 large egg
• 4 Russet potatoes, peeled and quartered ((about 3 pounds))
• 2 tablespoons salted butter, at room temperature
• 2 cups shredded sharp cheddar cheese. plus more for topping
• 2 ounces cream cheese
• kosher salt and black pepper
• 4 thick cut slices bacon, chopped
• 4 tablespoons salted butter
• 2 yellow onions, thinly sliced
• 3 tablespoons apple cider vinegar
• 1 tablespoon fresh thyme leaves