Pierogies Cheddar buatan sendiri

Bahan-bahan (40 porsi)

• 2 cups all-purpose flour
• 1 teaspoon kosher salt
• 2 tablespoons butter, melted
• 1 cup plain full fat greek yogurt
• 1 egg
• 4 russet potatoes, peeled and quartered
• 2 cups shredded sharp cheddar cheese, plus more for topping
• 2 tablespoons butter, at room temperature
• 1/2 teaspoon onion powder
• kosher salt and pepper
• 1 stick butter
• 1 -2 cloves garlic, minced or grated ((to your taste))
• 1 tablespoon chopped fresh rosemary