Onion Rugelach - Boys of Cooking

Ingredients

• 1 cup flour
• 2 teaspoons sugar
• 6 ounces cream cheese
• 1¼ sticks unsalted butter
• 2 tablespoons sour cream
• 2 cups chopped onion
• 1 egg
• 2 tablespoons milk
• 1½ teaspoons sesame seeds (not toasted)
• ¼ teaspoon salt
• 6 ounces cream cheese, softened
• 6 tablespoons (¾ stick) unsalted butter, softened
• 1 tablespoon plus 1 teaspoon unsalted butter
• 2 tablespoons unsalted butter
• 1½ teaspoons sesame seeds