Heat the oven. Preheat oven to 350°.
Make the meatballs. Mix the lamb, oregano, thyme, dill, garlic powder, onion and lemon zest together in a small mixing bowl. Using a tablespoon sized scoop, form the mixture into balls, it should make 12 - 13 meatballs. Place meatballs on a baking sheet and cook for 20 minutes.
Cook the brown rice. While the meatballs are cooking add the brown rice to a medium saucepan. Add ¾ cup of water. Bring to a boil; cover and reduce heat to medium-low. Simmer for 20 minutes until water is absorbed and rice is tender.
Cook the cauliflower rice. Follow the package directions for the particuar type of rice you are using.
Make the sauce. To make the sauce combine the yogurt, cucumber, dried garlic and dill in a small bowl; mix well. Add the lemon juice and stir until combined. Refrigerate until ready to use.
Assemble the bowls. To assemble the bowls divide the brown and cauliflower rice between two bowls. Top with meatballs, tomato, onion, cucumber, pita chips and sauce. Serve immediately.