- Preheat the oven to 325 degrees F. Place a piece of parchment onto a rimmed baking sheet and spray with Primal Kitchen Avocado oil spray and set aside. 
- Separate the eggs (save the yolks for another recipe like my keto ice cream, hollandaise, mayo or lemon curd), and place the whites into a large bowl or stand mixer. Add the allulose, gelatin, salt and cream of tartar if using and whip the whites for a few minutes until VERY stiff. 
- Turn the mixer to low and gently mix the egg white protein powder into the whites. Do not over mix or it will end up like styrofoam. 
- Spread the protein sparing pretzel mixture onto the prepared baking sheet. 
- Bake for 8 minutes or until just starting to cook through. Remove from the oven and use a pizza cutter to cut into 1 inch thick strips. Gently use your hands to twist each strip into a pretzel shape and place back onto the baking sheet. Repeat with remaining strips of pretzel dough. 
- Place back into the oven and bake for another 10-15 minutes or until dark golden brown and cooked to your liking. Remove from oven. 
- If desired, brush the tops of each pretzel twist with melted butter and sprinkle with coarse salt. Serve with brown mustard if desired. 
- Store leftovers in the fridge for up to 4 days or in the freezer for up to a month.