Preheat the oven to 325 degrees.
Chop the pineapple chunks into smaller pieces.
Combine the pineapple, onion, bell peppers, mayonnaise, mustard, Cheez Whiz, ham and eggs in a bowl; mix well.
Spread over hamburger bun halves or rye bread slices.
Arrange on a baking sheet.
Bake for 3 to 5 minutes or until heated through, being careful not to burn the buns.
Turn on the broiler for the last minute of heating to brown the tops slightly.