Preheat oven to 350 degrees
Place meatballs on a jelly roll pan and heat according to directions on package.
Add slices of Kerrygold Swiss to top of meatballs and heat until just melted, about 3 minutes.
While meatballs are baking, start prepping the toothpicks.
Skewer half of a grape tomato and a little of the green leaf lettuce. When meatballs are done, remove from oven, add meatball to the end of the toothpick and serve immediately.