Step 1

Preheat oven to 450° F. Line a baking sheet with foil and spray it with cooking spray.

Step 2

In a large bowl whisk together the panko, parsley, grated onion, garlic, lemon zest and juice, egg, spices, salt and pepper. If you aren't planning to stuff the meatballs with a cube of feta add the feta crumbles to the mixture.

Step 3

Add the ground beef to the mixture and combine with your hands being careful not to over-work the meat mixture. Form approximately 1 tablespoon sized meatballs. If you are stuffing the meatballs with feta, stuff a small cube of feta into the center of each meatball making sure it is completely covered.

Step 4

Place the meatballs on the prepared baking sheet, spray the tops with cooking spray, then place the baking sheet on the center rack of the oven and bake for approximately 12-15 minutes or until golden brown.

Step 5

Make the tzatziki sauce while the meatballs are baking by combining all of the ingredient in a medium sized bowl and stirring together until combined.

Step 6

Remove the meatballs from the oven and serve with the tzatziki sauce.