Heat Oven to 375 Degrees.
Combine the lean ground beef, onion, garlic, spices, parsley, breadcrumbs, egg, and cheese in a large bowl.
Roll the meat mixture into small balls and place them on a sheet pan. Parchment Paper is ideal for easy clean-up and to ensure no sticking.
Place meatballs in oven for 15-20 min or until brown and done. For even browning, roll them over half way through if desired.
While the meatballs are cooking, prepare the veggies for the inside of the pita.
Heat the 4 Pita Bread for 30 seconds in the microwave for easy rolling. Spread Tzatziki on the bottom of each pita.
Layer veggies in order of lettuce, cucumber, tomatoes, and red onion.
When meatballs are completed, place 4 in the centre of the pita and veggies, add extra Tzatziki on top if you wish.
Bring both sides up and tuck the bottom in and ENJOY! (this can be a bit messy, but so worth the flavors.)