In a large bowl, combine yeast with lukewarm water; whisk until yeast is dissolved. Let stand for about 3 minutes until foamy.
Add butter, salt, sour cream & potato; mix well. Add bacon, chives & sun-dried tomatoes; mix until just combined. Stir in flour, one cup at a time. When dough is completely blended, turn onto a lightly floured work surface.
Knead dough for about 10 minutes, until smooth & elastic. Place dough in a lightly greased bowl, cover with plastic wrap & let rise in a warm place until doubled in size, about an hour.
Assembly/Bake
Line a baking sheet with parchment paper, set aside.
Remove risen dough from bowl, turn onto lightly floured surface; roll dough to about a 12 x 15-inch rectangle. From the long side, roll the dough like you would for a cinnamon roll & seal the edges. Using a piece of floss, cut roll into 10 pieces.
Place buns on lined baking sheet & lightly brush with egg wash. Sprinkle with everything bagel seasoning. Allow to rise while oven is heating.
Preheat oven to 375 F.
Bake for about 25-30 minutes until light golden brown.
Burgers
In a large bowl, place all burger ingredients. Mix ONLY until combined. Divide mixture into 10 equal portions & form into patties.
Prepare all burger toppings. When buns are baked, grill burger patties, adding cheese slices toward the end so they can melt. Slice buns (grill for a few minutes if you wish) then ‘load’ burgers & serve.