Preheat oven to 400 degrees.
In a small bowl, mix the softened butter, Greek yogurt, and salt. Refrigerate until ready to serve.
Toss the cut potatoes with 1 tablespoon oil, ½ teaspoon salt, and ¼ teaspoon pepper.
Spread the potatoes evenly on a baking sheet and roast in a preheated oven until lightly golden and softened. Set aside.
Dissolve the yeast in a small bowl. Stir in 2 tablespoons sugar and allow the mixture to get foamy (approximately 5 minutes).
Place the flour in a bowl of a stand mixer along with 1 teaspoon salt.
Stir in the foamy yeast into the flour mixture and mix with the dough hook until the dough forms a shaggy ball.
Turn the dough out onto a lightly floured surface and hand-knead the dough for 2-3 minutes.
Return the dough to the bowl of the stand mixer, cover with plastic wrap. Allow the dough to rise in a warm, draft-free place until doubled (approximately 60 minutes).
Once doubled, divide the dough into two equal pieces.
Roll each half of dough out onto a lightly floured surface (keeping the other covered to not dry out) to form an approximate 13″ circle (roughly ¼” thick).
Drizzle and evenly spread the dough circles evenly with 1 teaspoon sesame seed oil, half the roasted potatoes, half the green onions, half the bacon, half the shredded cheese, and a sprinkling of black pepper.
Gently but tightly roll the dough into a jelly roll or long snake form.
Once fully rolled, carefully and gently stretch the dough to elongate and even out the thickness (if needed).
Starting at one end of the roll, coil the dough for form a large spiral.
Gently flatten the spiral with your hand to form an approximate 10″ disc.
Continue the same process with the other half of the dough and the remaining ingredients.
Add 1 tablespoon of grapeseed oil to a large cast-iron skillet and cook the bing bread over medium/high heat until golden brown on both sides.
Meanwhile, in a small bowl, whisk together the soy sauce and ½ tablespoon sugar.
Brush one side of the browned bing bread with a liberal amount of the soy sauce mixture and sprinkle with 1 tablespoon sesame seeds.
Place the skillet into a preheated oven and bake for approximately 13-15 minutes until cooked through.
Remove and repeat the same process with the second coiled disc.
Bing bread is best served warm, cut into wedges, along with the yogurt butter.