For filling: ½ cup salted or unsalted buttercold, cut into 8 equal cubes
**Coffee crust:**
5tbspbutter
¼cupsugar
1large egg
2tspinstant coffeemixed in 2 teaspoons water
½cupall-purpose flour
1tbspcornstarch
Instructions
**Make the Buns:**
- Mix the warm milk, sugar, yeast, flour, egg, salt, and ¼ cup softened butter in a large bowl until a shaggy dough forms.
- Turn the dough onto a clean surface and knead for 15 minutes. The dough will be sticky at first but will become smooth and stretchy. Do not add more flour.
- Alternatively, use a stand mixer with a hook attachment and knead for 10-12 minutes.
- Transfer the dough to an oiled bowl, cover with cling wrap, and let it rise in a warm spot until it doubles in size (about 90 minutes).
**Shape the Buns:**
- Punch down the risen dough and divide it into 8 equal pieces.
- Roll each piece into a tight, smooth ball.
- Flatten each ball into a disc (about 3.5 inches in diameter), place a cube of cold butter in the middle, and pinch the dough into a ball, ensuring the butter is well-sealed inside.
- Place the buns on a baking sheet lined with parchment paper, leaving at least 3 inches between each bun.
- Let the buns rise again for 30-45 minutes until puffed up.
**Prepare the Coffee Crust:**
- Whisk together the butter and sugar until light and fluffy. Add the egg and coffee mixture, and whisk again.
- Sift in the flour and cornstarch, then whisk until just combined.
- Transfer the mixture to a piping bag with a small opening.
**Bake the Buns:**
- Preheat the oven to 350°F during the last 20 minutes of the second rise.
- Pipe the coffee crust onto each bun, starting from the top and swirling outward.
- Bake for 18-20 minutes until the crust is light golden and crispy.
- Let the buns cool for 15-20 minutes before serving.
Notes
Store the Papparoti coffee buns in an airtight container at room temperature for 2-3 days and reheat in the oven before enjoying.