Pour a light glug of olive oil in a large bowl and swirl it all around. You want to make sure the bottom and sides are evenly covered in oil, but that it isn't heavily pooling on the bottom. Set aside.
In the bowl of an electric stand mixer fitted with the dough hook attachment add the milk, water and yeast. Let mingle and get frothy for about 5-10 minutes.
Once you see the yeast foaming up over the top of the liquid, add in the honey, olive oil, flour and salt. Knead for 10-15 minutes on medium until a ball has formed that isn’t sticking to the sides of the bowl.* However, it may be sticking to the bottom of the bowl and the dough will be slapping the sides. Sprinkle the dough with a light dusting of flour to help get it out of the bowl and set it in the large bowl that's lightly oiled. Rotate the dough so that the top and bottom of the dough has a light covering of oil over it. Loosely cover the bowl with plastic wrap or a damp towel and let rise for 1 1/2 to 2 hours or until double in size. *You could also just use your hands to knead the dough together on a floured surface.
Once the dough has doubled preheat your oven to 350F/177C and place a rack in the center of the oven. In a small bowl, whisk together the egg yolk and the cream. In another small bowl, whisk together the sugar and cinnamon. Set both bowls aside. Cover two baking sheets with parchment paper and lightly dust one with flour. Separate the dough into 10 equal pieces (about 90g each) and place on the lightly floured baking sheet. Rest a damp cloth over the top to keep the dough from drying out.
Use your hands to gently stretch the dough to about a 4 inch (10 cm) circle. Sprinkle some chocolate chips underneath the dough and gently press down to adhere them to the dough. Grab 2-3 tablespoons each of chocolate chips and marshmallows and place in the middle of the dough. Grab 1/4 of a graham cracker and crumble it over the top. Grab the edges of the dough and pinch together to seal in the filling. Place the dough seam side down on a clean workspace (your counter will do fine). With one hand cupping the bun, gently rotate it around the palm of your hand to smooth out the bottom and place on the other parchment-covered baking sheet. (This video is not super pretty, but watch how she does the final shape of the balls.) Repeat with remaining pieces of dough, until all 10 are stuffed. Make sure to leave 3 inches (7.5 cm) between the unbaked rolls.
Gently brush the egg wash (eggs + cream) over the dough balls, taking care not to let it pool around the bottoms. Sprinkle the tops with cinnamon sugar and then place your baking sheet in the center of the oven and bake for 15 minutes. Rotate the baking sheet and bake for 5-8 minutes more or until golden and baked through. Once out of the oven, move to a cooling rack to finish cooling. They're pretty delicious slightly warm. Once cool, store in an airtight container. Highly recommend eating the same day they are baked. HEAVEN!
Thank you for baking these White Trash S'mores Buns! Please tag me @displacedhousewife #displacedhousewife #fomobaking so that we can see your gorgeous bun photos!! Happy baking!