1. Preheat oven to 450°F.
2. Combine the oats with the milk in a small bowl and let soak for at least 15 minutes (the oats will soften and absorb the milk).
3. In a separate large bowl, mix together the chopped mint, scallions, oregano, garlic, lemon zest, cumin, coriander, pepper and salt; add the lamb and oat mixture and mix with your hands until thoroughly combined.
4. Roll into 1+1/2 inch meatballs and evenly space on prepared baking sheet lined with foil (use a wire rack if you have one!); roast until meatballs are lightly browned, about 20 minutes.
5. Mix together ingredients for the tzatziki and serve on the side - enjoy!
