Make the Meatballs: In a large mixing bowl, combine ground beef, minced garlic, finely chopped onions, breadcrumbs, baking soda, chopped fresh herbs, olive oil, salt, and pepper. Mix until well blended, cover, and refrigerate for at least 2 hours.

Bake the Meatballs: Preheat your oven to 425°F (220°C). Form the meat mixture into small meatballs, about 1-inch in diameter. Arrange on a parchment-lined baking sheet and bake for 30-40 minutes, turning halfway through, until cooked through.

Prepare Roasted Potatoes: While the meatballs bake, wash and cut the potatoes into wedges. Toss with olive oil, cumin, paprika, dried oregano, salt, and pepper. Roast in the same oven for 40-60 minutes until crispy, flipping halfway.

Make Tzatziki Sauce: In a mixing bowl, combine thick Greek yogurt, grated cucumber, minced garlic, lemon juice, chopped herbs, and a drizzle of olive oil. Season with salt, mix until smooth, and refrigerate for at least 15 minutes.

Assemble the Bowl: Layer fresh lettuce, roasted potato wedges, baked meatballs, and tzatziki sauce in a deep bowl. Garnish with chopped tomatoes, cucumbers, red onion, and kalamata olives.