In a large bowl, mix together spinach and onions. Place salad in a. 13 x 9 inch glass dish or plastic container. Cut off tops and bottoms of peppers; remove seeds. Cut peppers in half with a horizontal cut, and remove membranes. Using a 2 inch or smaller star-shaped cookie cutter, cut 5 stars from each pepper. Place pepper stars in rows of 3 down and 5 across. Place eggs in rows between the stars. Serve with poppyseed dressing.