Zimt Wuppis aus Hefeteig My Grandmas Secret Cinnamon Buns

Ingredients

• 1 cup (240ml) whole milk, warmed to lukewarm
• 2 ¼ teaspoons (7g or 1 packet) active dry yeast
• ¼ cup (50g) granulated sugar
• ½ teaspoon salt
• ¼ cup (57g) unsalted butter, melted
• 1 large egg
• 3 ½ cups (420g) all-purpose flour, plus more for dusting
• ½ cup (113g) unsalted butter, softened
• ¾ cup (150g) packed light brown sugar
• 2 tablespoons ground cinnamon
• Pinch of ground nutmeg (optional)
• 2 cups (240g) powdered sugar
• ¼ cup (60ml) milk, or more as needed
• ½ teaspoon vanilla extract