Brown Butter Sage Pierogi Recipe by Tasty

Ingredients

• 1 lb russet potatoes, peeled and halved
• 1 cup chopped onions
• 6 tablespoons unsalted butter, divided
• ½ cup shredded cheddar cheese
• ¼ cup sour cream
• 1 teaspoon salt, plus more to taste
• 1 teaspoon pepper, plus more for serving
• 1 ½ cups all-purpose flour, plus more for dusting
• ⅓ cup warm water
• 1 tablespoon olive oil
• 1 large egg, lightly beaten
• 10 fresh sage leaves