Preheat the oven to 350°F (175°C) and spray a 9x13-inch baking dish with nonstick cooking spray.
Prepare the Chicken Rice-a-Roni according to the package directions, using the butter and water called for on the box.
Stir the condensed cream of chicken soup and 1/2 cup milk into the cooked rice until well combined, then spread this rice mixture evenly in the prepared 9x13-inch dish.
In a mixing bowl, combine the cooked chicken, 2 oz cream cheese, 3/4 cup shredded cheddar, 1 tbsp milk, onion powder, garlic powder, and salt and pepper to taste; stir until smooth and evenly mixed.
Separate both cans of crescent roll dough into triangles (total triangles from both cans). Place a portion of the chicken mixture near the wide end of each triangle, roll up tightly, and arrange the roll-ups seam-side down on top of the rice in the baking dish.
Bake for 20–25 minutes, until the crescent rolls are golden brown.
Optional: sprinkle additional shredded cheddar over the roll-ups and bake 3–5 more minutes, until the cheese melts. Garnish with chopped fresh parsley if desired and serve warm.