Preheat the oven to 400°F (200°C). In a mixing bowl, combine ground beef, garlic powder, onion powder, oregano, salt, pepper, egg, and breadcrumbs. Mix until well combined.

Form the mixture into meatballs, about 1 inch in diameter, and place them on a baking sheet.

Bake in the preheated oven for 20-25 minutes until cooked through.

In a bowl, combine Greek yogurt, grated cucumber, minced garlic, olive oil, lemon juice, dill, and salt. Mix well and refrigerate until ready to serve.

In a saucepan, heat olive oil over medium heat. Add rice and toast for 2-3 minutes.

Add chicken broth, lemon zest, lemon juice, and salt. Bring to a boil, then reduce heat, cover, and simmer for 15-20 minutes until rice is tender.

In a large bowl, combine sliced cucumbers, cherry tomatoes, and red onion.

Drizzle with olive oil and red wine vinegar, sprinkle with oregano and salt. Toss to combine.

In serving bowls, layer lemon rice, meatballs, cucumber salad, and a generous dollop of tzatziki sauce on top.

Serve immediately and enjoy!