Place the flour, sugar and yeast in the bowl of a stand mixer.
Whisk together and then form a well in the centre.
Add the warm milk and egg yolk in the centre of the well and knead with the hook attachment until the liquid has been absorbed.
Add in the orange zest, the beans of one vanilla pod, and the honey.
With the hook attachment, knead until the zest, honey, and vanilla have been evenly distributed.
Knead in the butter a little at a time and end with the salt. Once all the butter has been incorporated, knead for approximately 8 to 10 minutes. You will end up with a very stretchy, soft dough, barely clinging to the side of the bowl.
Transfer the dough to a greased bowl. Turn the dough to grease all over and cover with cling wrap.
Let the dough rise in a warm, draft-free space until it triples in volume for about two hours.
Divide the dough into 12 equal portions of approximately 48 grams each...give or take.
One at a time, fold the dough over, then turn it clockwise and fold again while repeating this six times. Gently bring together the bottom of the dough to seal.
Cup the dough ball between your thumb and index finger and make circular motions with the dough ball until you have a perfectly round-shaped dough ball.
Place the dough balls onto a baking sheet lined with parchment paper.
Spray two sheets of cling wrap with baking spray and cover the dough balls with the cling wrap. (sprayed side down).
Set aside to rise in a draft-free area for one hour.
Make the egg wash by beating together 1 whole egg with 2 tablespoons of heavy cream.
When the dough balls have risen brush them with the egg wash mixture.
Preheat oven to 350 degrees F.
Bake the sweet buns for 20 minutes. Allow the buns to cool completely before filling them with whipped cream. Otherwise, you'll have one soggy mess.