When the display panel on the cooker reads HOT, add the meatballs and olive oil. Gently stir the meatballs to brown them on all sides, about 5 minutes. Layer the squash/zucchini noodles on top of the meatballs, followed by the sauce.
If you like your sauce a little less chunky, use a food processor to chop the diced tomatoes into a smaller size before using.
If your diced tomatoes are particularly watery, you may want to drain them a little prior to use.