These Sneaky Mommy Meatballs are mother tested and kid approved! They're full of flavour and hidden healthy veggies, and a perfect accompaniment to spaghetti, or in our Sneaky Mommy Meatball Subs. To freeze, place the meatballs on a parchment-lined baking sheet and freeze until solid, then put the frozen meatballs in an airtight container or plastic bag for up to 3 months.