For the Dough:

1. 1. Preheat your oven to 375°F (190°C). Line a baking sheet with parchment paper or lightly spray it with nonstick cooking spray.
2. 2. Unroll crescent roll dough onto a flat surface and arrange it in a circular pattern on the baking sheet, with wide ends overlapping slightly in the center and points extending outward.

For the Filling:

1. 3. In a skillet over medium heat, brown the ground beef and chopped onion until fully cooked. Drain excess fat. Stir in taco seasoning and water according to packet instructions.
2. 4. Spoon the seasoned beef mixture onto the wide ends of each triangle. Top generously with shredded cheddar cheese.
3. 5. Fold each triangle over the filling and tuck it under itself to form a sealed ring.
4. 6. Place in the preheated oven and bake for 20-25 minutes or until golden brown.
5. 7. Transfer to plates and drizzle with sour cream before serving.