Preheat a convection oven to 400°F (204°C) and line a rimmed baking sheet with parchment paper.
In a primary mixing bowl, combine ground chicken, panko, egg, garlic, parsley, dill, mint, lemon zest, salt, and pepper until uniform.
Portion the mixture into 1.5-ounce spheres and arrange them 1 inch apart on the baking sheet.
Bake for 18 to 20 minutes until the internal temperature reaches a minimum of 165°F (74°C).
In a separate bowl, toss tomatoes, cucumber, and red onion with olive oil and a pinch of salt.
Distribute 0.5 cups of warm quinoa into four serving bowls.
Place 4 to 5 meatballs in each bowl, add a portion of the vegetable salad, and finish with a 2-tablespoon dollop of Greek yogurt.