Yeast: In a small bowl, combine the warm milk, packet of yeast and a teaspoon of sugar and let sit and foam for about 5 minutes.
¾ cup (202 g) +1 tablespoon warm milk, 110℉, 1 package (7 g) active dry yeast, 1 teaspoon granulated sugar
First knead: In a bowl of a stand mixer fitted with a hook attachment, add flour, sugar, salt, pumpkin pie spice, 2 egg yolks, vanilla extract, and the activated yeast mixture and let knead for at least 10 minutes until the dough comes away from the bowl and forms a sort of ball.
3 cups (360 g) bread flour, ⅓ cup (66 g) granulated sugar, ¾ teaspoon salt, 1 tablespoon pumpkin pie spice, 2 egg yolks, 2 teaspoon vanilla extract
Second Knead: Start adding the softened butter slowly until all is incorporated and knead for an additional 12-15 minutes until the dough forms a smooth ball and does not stick to the sides of the bowl. When touching with your finger, the dough should not stick at all. The dough will be tacky and a lot smoother/silkier than a regular dough.
6 tablespoon (84 g) unsalted butter
Important: Don't add more flour. Let the dough knead and come together. It will be tempting to add more flour, but trust the process. If you weighed your ingredients using a scale, the dough should all come together.Humidity: If you live in an area with high humidity, you may need to add extra flour or reduce the amount of milk added to the dough. I've had readers have success with either adding more flour or reducing the milk. I've had to add more flour during the summer months when humidity is high. Windowpane test: To know if your dough is ready, perform the windowpane test where you take a small piece of dough and stretch it out between your fingers. If it stretches out without tearing and light can pass through, then it has passed the windowpane test. If it tears, let the dough knead another 5 minutes, then perform the test again.
First proof: Place the dough in an oiled bowl and cover and let rise for at least an hour.