Preheat the oven to 375℉. Prepare a 15" round pizza pan or a large baking sheet (12"x17") by spraying it with nonstick cooking spray or lining it with parchment paper. Set aside.
Stir the packet of taco seasoning and the water into the ground beef until combined. Bring to a boil. Once boiling, reduce the heat to medium and let it simmer for 5 minutes.
Remove the bowl from the center. Grab the point of each crescent and fold it over the meat and cheese layers, and gently tuck and press it under to secure. Repeat all the way around the ring.
Whisk together the egg and water until combined. Use a pastry brush to apply a coating of the egg wash to the outside of the ring on the crescent dough.