Combine almond flour, coconut flour, guar gum, baking powder and salt in a food processor. Gently pulse until just combined.
Mix apple cider vinegar and lime juice and stream into the food processor while it's running.
Once combined, pour in the egg. If the mixture still looks powdery and not dough like, slowly add up to 2 tablespoons of water, 1 tablespoon at a time. You may not need the water.
Stop the food processor once the dough forms into a ball.
Wrap dough in plastic wrap and knead for a couple of minutes. Then let the dough rest for 15 minutes.
Remove set dough from plastic wrap and cut into 8 pieces. Roll into balls and then roll with a rolling pin into 5-inch rounds. I recommend placing the balls in between plastic wrap or parchment paper for to eliminate sticking.
Transfer to skillet and cook over medium heat for and cook until just lightly golden. These tortillas will puff up! Only cook them for about 30 seconds on each side...you don't want to over cook.
Eat immediately and store unused dough in fridge for up to three days.