Bring all ingredients to room temperature. If warming egg whites, place whole eggs in a bowl of very warm water for a few minutes while gathering other ingredients.
If mixing from scratch, whisk together dry ingredients except yeast; set aside.
In a large mixing bowl, combine egg whites, olive oil, cider vinegar and water.
Using a stand mixer (preferably), slowly add in the dry ingredient mix plus quick rise yeast (or 1/2 gfJules™ Gluten Free Pizza Crust Mix OR dry ingredient blend from ingredient list). Gradually add remaining liquid to get a firm but very sticky dough that can still be spread. Once integrated, beat on high for an additional 2-3 minutes. Lastly, stir in the shredded cheese.
Prepare pizza pan or baking sheets by lining with parchment and spraying lightly with cooking oil. Spoon 5 lines of dough out onto the pan and liberally oil your hands with olive oil to shape the bones (dough will be sticky, so make sure to have lots of oil on your hands!). OR Liberally dust a sheet of parchment paper or a silicone baking mat with gfJules™ All-Purpose Gluten Free Flour. Dust your hands and rolling pin, as well. Spoon 5 balls of dough out one at a time and roll each into bone shapes. Make sure to emphasize the shape, as once each "bone" rises and bakes, the shape will be somewhat less obvious.
Cover with parchment and let them rise 15-20 minutes in a warm spot like a warming drawer or oven preheated to 200º F and turned off.
Preheat the oven to 375° F (static). After the bones have risen, bake for approximately 15 minutes. The cooking time will vary depending on the size of your bones, but they should have risen nicely by this time, and just begun to slightly brown. A toothpick inserted should come out clean or with dry crumbs.
For even cheesier bones, sprinkle with more shredded cheese. For pizza bones, slice each bone in half and spread sauce and add toppings. Cook an additional 5 minutes, or until the cheese is bubbly, if using.