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1
For the dough:
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2
Add the hot water into a small bowl or measuring cup. Sprinkle the yeast over the water and gently mix to combine. Allow the yeast to bloom and become foamy, about 5-10 minutes.
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3
In the bowl of a stand mixer fitted with the dough hook, add 4 and 1/2 cups of flour, sugar, and salt. Turn the mixer on low and mix for 10 seconds to combine.
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4
In a bowl, whisk together melted butter, milk, vanilla extract, and 2 eggs. With the mixer on low (speed 2) add the yeast mixture to the bowl of the mixer. Slowly pour in the butter mixture. Continue to mix on low, scraping the flour from the sides of the bowl as you go. Once all of the flour is incorporated into the dough, slowly add and additional 1/2 cup of flour, scraping the sides of the bowl as needed.
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5
Stop the mixer and remove the dough from the hook and scrape down the sides and bottom of the bowl. Turn the mixer on low (speed 2) and gradually add the chocolate chips. Continue to mix on low for 5 minutes.
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6
Transfer the dough to a lightly floured surface. Continue to knead the dough by hand, gradually adding the remaining 1/4 cup of flour to the dough. The process will take an additional 5 minutes. You'll know the dough is ready when it's elastic and no longer sticky.
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7
Place the dough in a large lightly greased bowl. Cover the bowl with a clean, dry towel and let it rise for 1 and 1/2 hours.
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8
Gently punch down the dough. Transfer the dough to a lightly floured surface and measure out 15 (95 gram size) dough balls-I highly recommend using a scale. Roll each piece of measured dough until it forms a smooth ball. I do this by placing the dough on a smooth surface and rolling my palm over the dough in a circular motion.
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9
Grease a 9-inch-by-13-inch pan with butter or non-stick baking spray. Place the dough in the pan, spacing them 2 inches apart. You should end up with 5 rows, each row made up of 3 dough balls. Cover the pan with a clean, dry towel. Allow the buns to rise for 1 to 1 1/2 hours, or until double in size.
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10
Preheat the oven to 350 F.
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11
Make an egg wash by whisking the remaining egg with the listed amount of water in a small bowl.
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Gently brush the tops of the buns with the egg wash. Bake the buns for 28-30 minutes, or until the buns are a deep golden brown. Remove from oven.
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13
Place the buns on a wire rack and allow them to cool completley in the pan. Pipe the tops of the buns with the icing to resemble a cross.
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14
For the icing: Whisk together powdered sugar and cinnamon in a large bowl. Whisk in 2 tablepoons of milk. You want the mixture to be thick enough to pipe. If the mixture is too thick, gradually whisk in the extra tablespoon of milk until smooth. Transfer the mixture to a piping bag or large zip-close bag. Snip off the end of the bag.
