Preheat oven to 350 degrees farenheit. Saute chicken in olive oil with the onions and garlic until the chicken is no longer pink and the onions are translucent. Add spaghetti sauce and mozzarella; mix well. Take one can of crescent rolls out of the fridge and open it. leaving an open circle in the middle, place crescent triangles in a circle with the points radiating out making a sun pattern overlapping edges slightly. Take 2nd can of crescents out of refrigerator and place crescent triangles between the angles of the other triangles so that it now resembles a star with 16 points. Mound chicken mixture around the inner ring and pull points over the mixture to encase in pastry. Bake for 25 minutes or until golden brown.